Those are top-tier professional staples. Mac users can't chose another Photoshop, because there's no other at that level (Affinity and co are great, but nowhere as comprehensive).

But even so, Photoshop, Premier and co, has ties to native functionality, gets the native look and feel for things like file dialogs and such, is quick to move to Apple Silicon / M1 natively (and even has a native iPad version, complete with native UI) and so on.

It's not some lowest-common-denominator cross platform affair, like most cross platform lesser GUI apps are.

Also, Word and co. Microsoft apps are not cross-platform. They are special codebases for macOS, complete with macOS native UI and everything.

True, but at the same time the Adobe apps certainly doesn't feel as "native" as they could have. Affinity feels much better for example.

Affinity is also cross-platform.

A better example would be Pixelmator.

As true as this is, when it comes to Adobe products there's also no shortage of griping about things like UIs getting progressively more glitchy and less responsive and bad or nonexistent hardware acceleration… gripes that largely didn't exist 15 years ago when those same Adobe products were more closely tuned for the platforms they ran on instead of going all-in on one-size-fits-all.

Those gripes are universal cross platform gripes. Nothing to do with them being Mac specific. 15 years ago was CS2, already a cross platform app