As an aside, I have yet to be convinced that touch on desktop operating systems makes any kind of sense and the MacBook Ultra or whatever it ends up being called is unlikely to change my opinion on that. I much prefer an old-style low-whitespace, data-dense, pointer-first UI like OS X used to have. I’m tired of the virtual real estate on my screens declining year after year for the sake of functionality I’ll never use.
The future of desktop computing is probably going to be weird. I don't know how companies like Microsoft will manage to curb-cut their OS while also expanding to new UI/UX paradigms. Simplicity feels like a safe bet, and there's a lot of runway left to build the plane before the wheels go up.
GTK/Adwaita themselves aren’t terrible (particularly with CSS to tone down the acres of padding) but I still take issue with the quasi-mobile app direction in GNOME-oriented apps.
GNOME is designed to be touch-agnostic, which makes better use of padded UIs than macOS 11+ does. With a rumored touchscreen Macbook still coming down the line, I think GTK and the GNOME developers skated to where the puck was headed. macOS and iPadOS are both constrained for touchscreen users. GNOME is kinda the perfect UI for where Apple sees hardware converging.
I don't think GNOME can adopt any more macOS idiosyncrasies without being a worse holistic experience. The Overview/search accelerator on the Super key is faster than Spotlight search. The desktop switcher is a better-supported use of the menubar than forcing an unsupported global cluster. GNOME could try to cram these round pegs into their square hole, but they know it wouldn't improve things.