I don't support this ban, but I have to admit I'm more of a naturalist than a cultivator when it comes to gardens: weeds are plants too, right?
If there's significant evidence of karma fraud (even if that evidence isn't shared), that's a good reason. If it's just "annoying posts that don't get downvoted enough for our tastes", that's pretty weak.
I've seen quite a bit of evidence of karma fraud on their part.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.