Of course if the comment is not "well thought of" or "heartfelt" or "Sincere" or spam we can be able to determine with common sense if it deserves an upvote Mark.
Plus comments are regarded as posts too.
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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.