According to the article, overall acceptance rate on the notifications popup is 3%. But that will include legitimate notification requests like Gmail, Discord, Slack, etc..

That also includes people that just randomly accept any notification their computer gives them. This is older people who don't understand the specific permissions they are granting.

There was one time I was clicking on a navigation element right as a popup for notifications popped up and i accidently clicked it. I immediately went in and reverse the permission to block access, but I am sure there are use cases of accidental acceptance as well.

So considering all of that. My guess is that real intentional adoption is below 1%.

This is an occasional problem I've had on multiple platforms (Android/Windows OS, browser UI, ZoneAlarm way back when, etc). Why is it not yet a thing to ignore the first click within 50-100ms or so of a dialog popping up? Especially on desktop where you can find out if the cursor was already in place before the pop-up showed.

I'd imagine a lot more than 1-2%. Watching my Father use his phone the other day and he just says yes to every single thing that pops up without reading it first. I imagine a lot of the older generation are like that.