I mean... if you have to make the decision between a bloated ui and a simple one that does something well, then the latter would be the better choice. Especially in a market like this where power users could spin up their scripts that they can really customize.

But it doesn't have to be either or. These are big enough companies that they should be able to afford the time and resources to design easy-to-use UI that also allows the features power users are looking for. I know some people will say it's not easy - but this is a hard problem because of management and time. If you do enough testing and iterations, you will end up with a good UI. It's just no a priority for a lot of companies.