iOS 15 is introducing some welcome changes that I wouldn't mind Android copying in the future, such as notification summaries, but that does little to fix the core issues of iOS notification management.
I pretty aggressively manage notifications on my phone. And will selectively disable either the entire thing or the little red bubble depending on their use case.
Also you can clear individual notifications by selecting them or swiping them off. Or you can en-mass delete them, theres an X at the top right of the main banner
For example:
By default most are off. I really dont need notifications from say...Pandora or Zoom or Youtube.
For things that i check, work email, phone calls, texts or chat apps or even TOTP/push like DUO I allow the banners and badges but generally disable sounds.
My kids daycare app that is largely required for basic communication, absolutely abuses the communication feature. Every time a picture is posted you get one, and if they post say...10 you get 10. They ONLY get the bubble, so i know theres something i should check.
This makes it look like theres more work than I put into as well. In general i deny notifications. For those that I want it I allow them and if they abuse it, i simply trim down what is bothering it. Its actually a pretty solid system imho.