I understood Apple modernized the icons on iOS, because many users fell into the "I want to unify everything" mode. But I can't believe they done the same with macOS. Not only they screw up many icons (incl. my favorite; the Finder) - they destroy the investments of many indie developers.

But this is a tendency they have started long ago. Latest when they unified the shape, we should have send thousands of mails to Cupertino. No it is too late… is it?