If he's pissed at this, imagine how pissed he'll become when he enters the ridiculous Android ecosystem.
Anyway, he's free to choose whatever, but I have to nitpick here:
1. macOS 26 - a fiasco? Come on. A lot of like the liquid glass. On macOS I hardly notice it, but on iOS is actually beautiful to me. Also a long time macOS user, since 2003 btw. You can always dampen it using accessibility settings.
2. Age verification ? First time I've heard of it. Also on latest iOS. But then I'm also not in the UK.
3. "Interfaces built with AppKit or SwiftUI that rendered perfect, are now overlapping controls and clipping stuff. They have no consistency at all in terms of icons, placement, corners…". I'm all for constructive criticism. But where are you seeing this? I've got 8-9 apps open and none are inconsistent in my view. I'm picky about these things too. Genuinely I'd like to know.
I'm the author, some of the tahoe issues can be seen in:
https://tonsky.me/blog/tahoe-icons/
https://noheger.at/blog/2026/01/11/the-struggle-of-resizing-...
there are a lot more, but I don't have the links handy.