You are not me, obviously -- because I do find them useful. Not as often as many sites would like me to, but Firefox won't keep interrupting me after the first time I visit a site.

Most of my phone notifications come in silently, and I won't tolerate spammy notifications, but I do want notifications for low priority/async operations so that I don't need to remember to check each app for anything actionable: the SRE book talks about "page", "ticket", and "log" messages; a noisy notification is a "page", a silent one is a "ticket", and if I want to see "log"-type messages then I can check the relevant app.