Having to micromanage notifications is why I have two phones - one without a SIM card. It's nice to be able to do stuff on the phone and know it won't bug you. I simply put the one with the SIM card elsewhere (other room, leave in car, etc). No - I'm not going to spend too much time learning how to "effectively" manage notifications on a smartphone (and if I do, have it change on me with some future update).
I've been saying it since around 2004-2005 - even before smartphones - that consolidating everything into one device is a bad idea.
One thing I really miss from the 80's and 90's: When you buy a product (hardware or software), its features and capabilities were stable. You never had to worry about some update changing the behavior on you.
I really like some of the health features on Apple Watch. But I won't buy it because I don't want it to be my watch, and I don't want to pair my Apple account with it. I just want the health features and nothing else.