I started somewhat care less about notifications and emails and messages and whatnot. Unless people are in an urgency which I will reply, but normally I just reply whenever I am free. I'm not more productive, I just feel less attracted to the phone.
It's not supported on Vendor-locked older versions of Android, though I don't know what the present-gen device situation is.
I have absolutely zero intent to gain first-hand knowledge of said situation.
That was the element I was (perhaps insufficiently clearly) responding to.
I have Firefox on Android. It's a godsend. Or Mozillasend.
On the user side, what are our options?
Notification categories is not exclusive to google apps, of course (OS level feature as long as your app targets Oreo), but their apps tend to give you very good control over what it shows you.
So, I'd disagree strongly that this is a google "strategy". It's more a problem that their apps tend to have a lot of features crammed in.
Of course, I don't know how this works on iOS (I'd be surprised if it's not in the settings somewhere? It's in their interest that you don't disable all app notifications)
Edit: They definitely have, since I have those options now.
It doesn't matter much to me if the problematic behavior arises from strategy or accident, though.
Adding the ability to turn this stuff off is good, but it should be default.