In our office, we'd definitely need the enterprise version for compliance reasons, not because of the features. That's about 14/user/month.
At a workforce of roughly 2500, that's a 4million+ yearly cost for something that is comparable to something you can get without that pricetag. It's no competition at all at that point. Think about it, would you be willing to ask your boss to pay 4 million so you can have a different chat app? No matter how much more ergonomic and friendly and intuitive it is.