On MacOS is much better. But most of the team either ended up with locked in Mac-only or go cross platform with Electron.
You don't need to use microsoft's or apple's or google's shit UI frameworks. E.g. see https://filepilot.tech/
You can just write all the rendering yourself using metal/gl/dx. if you didn't want to write the rendering yourself there are plenty of libraries like skia, flutter's renderer, nanovg, etc
You will be outcompeted if you waste your time reinventing the wheel and optimizing for stuff that doesn't matter. There is some market for highly optimized apps like e.g. Sublime Text, but you can clearly see that the companies behind them are struggling.
He who holds the purse strings, decides. The people who pay to have the apps made get to decide and they have decided that what geeks want doesn't matter.
And every time a geek tries to change that, he only wins for a short while and then we're back to the primordial soup.
Oh, and regular users obviously don't care enough.