Lack of control over moderation. If a person says something spicy and other person in company reports it, it goes to discord moderation and be banned for few days (or at worst case, forever). Also no way to use enterprise auth.

But other than that it's better chat platform than any other I used and it is very versatile when it comes to programming it, if you need it. Making flow like "you need to go thru the rules, then you get access to rest of the server" is possible, I even saw cool stuff like "click this reaction to get subscribed to that group of channels"