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I vigorously request that the reputation system be revised to let people with higher reputation in other Stack Exchange sites be able to comment on questions/answers.
A possibly reasonable approach would be to make your privilege based on an average: if the average is above the reputation needed to post comments, then users should be allowed to comment everywhere. To make the system maybe a tiny bit more "resistant" to problems, there could be a minimum reputation to hold in at least two accounts, and to have at least 3 accounts associated.
I don't know if this makes sense to you, but it would be greatly helpful because, well, it's not very nice to be deleted questions.
I am very willing to behave "well" but if I don't have enough points to comment, how am I supposed to?