A factory-fresh smartphone isn't that distracting and very few of the worst offenders are really necessary for communication. Is the black and white strategy really better than simply uninstalling "algorithm apps"? Both OSs allow both extremely granular and broad editing of notifications. If you "need" Slack/email for 24hr work notifications, that's a cultural issue not a technical one.
In other words, I think we install a lot of unnecessary junk. Just use a phone like it's 2008 and there's no App Store yet.