So if only 50% of the users have this, we should assume that it's only 50% done, and that by the time everyone has this thing, it will be perfect? More serious

So if only 50% of the users have this, we should assume that it's only 50% done, and that by the time everyone has this thing, it will be perfect? More seriously, while "this doesn't work right" is part of the complaint, the larger complaint is "this is fixing something that wasn't really broken." If Slack wanted to improve their editor, that'd be great, but they could have done that without losing what people liked about the old system. It's not like there's a lack of "quasi-WYSIWYG" Markdown editors out there to take cues from.