Oh? They tried rust?
Lots of people seem really committed to OOP. Rust is definitely a bad fit if you can't imagine writing code without classes and objects. I don't think this makes rust is a bad language for the problem. Its just, perhaps, makes rust a bad language for some programmers.
It doesn't seem uncommon for someone to generally like Rust but still want to use something OO for UI. I'm in that boat. Never liked OOP much, but it makes sense sometimes.