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Plus comments are regarded as posts too.

Sure on the blockchain it has no knowledge of post/comment, everything is a comment. But a comment that takes you 3-5 seconds is not the same as a post that takes you 30-90 minutes.

The blockchain can tell the difference in that comments have a parent and posts do not. It just currently does not do so for most purposes (I believe there is still a time lockout on posts but not comments, but I'm not sure).

If we wanted to get rid of rewards on comments we could do so. It would make comments a lot cheaper in terms of RCs as well.