I want to. The apps want the opposite. Apple is unfortunately on the side of the apps.

By app store guidelines, it’s officially disallowed to use notifications for marketing. Of course the apps find their ways, at different levels of honesty. This has led to me turning off all notifications for some apps, but the problem is the mixing of channels. I don’t want my bank to send me ads, but I do want it to notify me about transactions.

Looks like you found the root of the problem already.