Its true that tons of news sites ask for permission just to spam you, or outright sell notifications to advertisers. I think the web notif channel has already been abused beyond repair. It may be time to redo the concept from scratch

Killer feature for email: add an email header that turns an email to notification. Then email apps would push the notification to the user, bypassing apple’s block. Websites already have the user’s email, so no need for more subscriptions. If gmail implemented this, it might push for adoption