I have flipped every imaginable switch and even set up a work profile, and I have not yet been able to turn off desktop notifications on my new work Mac. Every time I log in there's a persistent notification about... something stuck in the corner. The notification does not explain itself, clicking it just drops me into a system menu. Usually there's three or four such notifications queued up.
So it just lives there permanently on the desktop and I avoid using the thing as much as possible. I do all of my work functions through SSH and leave the Mac in a corner of my desk with the screen closed.
I swear, MacOS actively tries to be as annoying and intrusive as possible. Every time I touch the damn thing some new behavior reveals itself. Like there are two sets of hotkeys for copy/paste and which one you need to use appears to be entirely random per-window.
Thankfully work lets me use linux on my main machine and I almost never have to deal with goddamn MacOS. I would rather daily drive Windows 11 with copilot and cortana and piles of bossware than plain MacOS.