You're confusing it with something else. You don't have to have the same things. But there are basic understanding for UI like how certain elements should work. People might tolerate cos its not on their hands. But the moment they can, they'll make sure to not use it.

This also means more support tickets and internal escalations. Just like how you should drive predictably on road to avoid maximum accidents, predictable UI's are important for maximum productivity. People will use it more. And when they move to another software and don't get the same, they will talk sh*t about it. They will tell people how a certain software is soooo good.

ClickUp for example is the most disastrous UI I've used in recent history. If you get angry while using software, you've done your job poorly. When someone discussed about ClickUp, I immediately shut it down. It's the same reason why people disliked Jira. AWS console Etc. They might tolerate for a while. But they will jump ship at the first opportunity. So can't figure out how it is a feature.