Ultimately it will fall on the mods, as human beings, to enforce one way or another. Based on past performance, I have every reason to believe that they will err on the side of keeping posters around but even if we get an official policy of “hey, that’s not cool” followed by no other action it should have a positive effect on the community overall

Something like one person saying they liked a book while the other responds with saying they do like the book would likely be ignored for at least the first couple of comments until it became obvious that one or more of them were circumventing a ban and shut down then, but someone posting “ignore them, they don’t know what they’re talking about” might not be allowed to go on at all. It’s really up to the mods and/or the participants in the discussion

And, yeah, it sure sucks writing out a comment either long and detailed or just short and pithy before finding out that you’re banned, but it should only happen once.