The volume and power icons on the top right is actually one button and hides other option like screen lightning volume and wifi etc. If at list they had made a three vertical dots/stacked bars and is the convention for hamburger menus...
From what I heard GNOME devs do not like change and it sucks to be a GNOME extension developer, a quick google search seems to confirm that so it casts some doubt about them up-streaming any of them but maybe you know better. Has it ever happened to other extensions ?
https://discourse.gnome.org/t/developing-gnome-shell-extensi... https://www.reddit.com/r/gnome/comments/pvvku5/why_do_extens...
Haven't really used MacOS or iOS more that five minutes so I can only trust you on that.
On the other hand for example, it is very easy to remap CapsLock to Escape on MacOs. Just go to Setting --> Keyboard and you easily find the option. GNOME ? No, not in settings. Wait I have to use an app called gnome-tweak ? Ok it's in "Advanced keyboard otions" --> Opens a big list of loosely classified options. Oh well it was in miscellaneous category.