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Because meta-talk should be limited to the meta site only; such subjects are off-topic on the main site.

The [meta-tag:*] syntax only exists because [tag:*] use on a Meta site links to the main site tags. That's because the normal use-case for [tag:*] is to be used in tag wikis (to link to other tags) and from Meta when discussing specific tags, making it impossible to do the same for tags on the Meta site itself.

Addressing Air's bounty separately: Nothing changed with MSE becoming a dedicated site; Meta.SO split off, this site was renamed.

On Community Building, the Meta site would still be a per-site meta. Linking to tags there is still out of scope for the main site.

Meta.SE is not more separate now as when it was called Meta.SO, and it being a separate site still doesn't make talking about tags here on-topic for any other site, and adding linking support for Meta.SE tags on per-child Meta tags would have to be carefully thought out as it would conflict with the current use for [meta-tag:*] on such sites. I don't really see a use-case that is common enough to warrant a separate link mark-up, however.

Because meta-talk should be limited to the meta site only; such subjects are off-topic on the main site.

The [meta-tag:*] syntax only exists because [tag:*] use on a Meta site links to the main site tags. That's because the normal use-case for [tag:*] is to be used in tag wikis (to link to other tags) and from Meta when discussing specific tags, making it impossible to do the same for tags on the Meta site itself.

Addressing Air's bounty separately: Nothing changed with MSE becoming a dedicated site; Meta.SO split off, this site was renamed.

On Community Building, the Meta site would still be a per-site meta. Linking to tags there is still out of scope for the main site.

Meta.SE is not more separate now as when it was called Meta.SO, and it being a separate site still doesn't make talking about tags here on-topic for any other site, and adding linking support for Meta.SE tags on per-child Meta tags would have to be carefully thought out as it would conflict with the current use for [meta-tag:*] on such sites. I don't really see a use-case here that is common enough to warrant separate link mark-up, however.

Because meta-talk should be limited to the meta site only; such subjects are off-topic on the main site.

The [meta-tag:*] syntax only exists because [tag:*] use on a Meta site links to the main site tags. That's because the normal use-case for [tag:*] is to be used in tag wikis (to link to other tags) and from Meta when discussing specific tags, making it impossible to do the same for tags on the Meta site itself.

Addressing Air's bounty separately: Nothing changed with MSE becoming a dedicated site; Meta.SO split of, this site was renamed.

On Community Building, the Meta site would still be a per-site meta. Linking to tags there is still out of scope for the main site.

Meta.SE is not more separate now as when it was called Meta.SO, and it being a separate site still doesn't make talking about tags here on-topic for any other site, and adding linking support for Meta.SE tags on per-child Meta tags would have to be carefully thought out as it would conflict with the current use for [meta-tag:*] on such sites. I don't really see a use-case for that that is common enough to warrant a separate link mark-up, however.

Because meta-talk should be limited to the meta site only; such subjects are off-topic on the main site.

The [meta-tag:*] syntax only exists because [tag:*] use on a Meta site links to the main site tags. That's because the normal use-case for [tag:*] is to be used in tag wikis (to link to other tags) and from Meta when discussing specific tags, making it impossible to do the same for tags on the Meta site itself.

Addressing Air's bounty separately: Nothing changed with MSE becoming a dedicated site; Meta.SO split off, this site was renamed.

On Community Building, the Meta site would still be a per-site meta. Linking to tags there is still out of scope for the main site.

Meta.SE is not more separate now as when it was called Meta.SO, and it being a separate site still doesn't make talking about tags here on-topic for any other site, and adding linking support for Meta.SE tags on per-child Meta tags would have to be carefully thought out as it would conflict with the current use for [meta-tag:*] on such sites. I don't really see a use-case that is common enough to warrant a separate link mark-up, however.

Because meta-talk should be limited to the meta site only; such subjects are off-topic on the main site.

Addressing Air's bounty separately: Nothing changed with MSE becoming a dedicated site; Meta.SO split of, this site was renamed.

On Community Building, the Meta site would still be a per-site meta. Linking to tags there is still out of scope for the main site.

Meta.SE is not more separate now as when it was called Meta.SO, and it being a separate site still doesn't make talking about tags here on-topic for any other site, and adding linking support for Meta.SE tags on per-child Meta tags would have to be carefully thought out as it would conflict with the current use for [meta-tag:*] on such sites. I don't really see a use-case for that that is common enough to warrant a separate link mark-up, however.

Because meta-talk should be limited to the meta site only; such subjects are off-topic on the main site.

The [meta-tag:*] syntax only exists because [tag:*] use on a Meta site links to the main site tags. That's because the normal use-case for [tag:*] is to be used in tag wikis (to link to other tags) and from Meta when discussing specific tags, making it impossible to do the same for tags on the Meta site itself.

Addressing Air's bounty separately: Nothing changed with MSE becoming a dedicated site; Meta.SO split of, this site was renamed.

On Community Building, the Meta site would still be a per-site meta. Linking to tags there is still out of scope for the main site.

Meta.SE is not more separate now as when it was called Meta.SO, and it being a separate site still doesn't make talking about tags here on-topic for any other site, and adding linking support for Meta.SE tags on per-child Meta tags would have to be carefully thought out as it would conflict with the current use for [meta-tag:*] on such sites. I don't really see a use-case for that that is common enough to warrant a separate link mark-up, however.