I'm glad Android finally lets you block push notifications on a per-app basis. I block all push notifications except for incoming text messages. Why would I want to be interrupted in the middle of dinner for a promotional message??
I'm glad browsers have decided to simply block notifications by default. The constant insistent notification prompts by terrible developers trying to get me to accidentally sign up to their stupid blog news feed annoyed the crap out of me. I already had notifications set to denied by default long before browsers started shipping the policy and I do the same for other permissions.
Notifications are extremely useful for actual web applications. Blogs and news sites should stay the hell away from my notification area.
For a long time after their introduction, apps were still written for the old notification system, so many users probably missed the fact they could theoretically mute or block certain categories. When apps started targeting Android 8, developers had to use the appropriate channels, but I'm pretty sure it took months for most common apps to support this feature properly: many apps had a single category for all notifications even when they used the new notifications API.