[kyleee]

It's the current crop of supposed UI/UX experts though that have foisted this mess of material design, hidden menus, disappearing scroll bars, text fields that don't behave like text fields (ex. browser URL bar) etc. So yes, I do believe many programmers who have to suffer years and decades of UI/UX "advancement" (much of what is actually just design churn) and use computing environments extensively, can definitely have a lot of good input.

[least]

They are called "user" interface and "user" experience, after all. Any "user" can call it bad and it can be a valid point. It can also definitely be valuable input. But an engineer identifying a design flaw in a bridge or an English major identifying errors in language use are people that have specifically studied those things and have a depth and breadth of knowledge that most "users" don't. Programmers aren't UI/UX experts just because they use applications.