To approve tag wiki and wiki excerpts requires 5k.
To approve post edits requires 2k.
Given there are issues concerning tag wiki edits:
The suggested edits queue is the only queue that has reviews for moderation privileges that requires varying reputation.
Although it's another queue, it's a queue that could be cleared easily.
The advantage is users could have a separate quota to review tag wikis, and reviewers can periodically check the queue to see if there are pending edits.
As a side issue it may be easier to implement review bans or any other decisions that may be made down the track for reviewers approving copied content, etc.
Can we please have them in separate queues to make reviewing the tag wikis easier?
I've already requested Can we have an option to sort suggested edits by type?, but nothing has come of this, so I thought I'd see if the community would prefer a separate queue.