90s, early 2000s were peak times for UI.
It was a time when tech companies were trying to make computers a common household item, so they did tons of user testing and we made great strides in UX as discoverability became king. Then, starting about 10 years ago, they started throwing all that research out the window in favor of minimal, clean, flat, "sleek" UIs because the screenshots are easier to market. They started appealing to the lowest common denomina…
I disagree with every single thing you've said here. And I'd be willing to bet most Apple users do too.
That being said, I do think there's some charm in simple, "outdated" UIs.