Do you need a panel to decide whether "great post" or "I agree" comments are useless? No, of course you don't. In cases like that it's blatantly obvious that they add nothing to the discussion that an upvote does not and it's those post and those posts only which I'm talking about.
No it won't be hate speech next or anything else. What a strawman! If you have sex with a adult, what next? Sex with children?
If people are simply posting "Great post" rather than using the upvote button then they clearly don't have anything to say or add to the discussion and are just making steem worse for everyone who is actually interested in using the platform. If someone has nothing to say, how can they be censored?