I think the issue is that disabling notifications entirely from an application is undesirable; applications (Uber, Starbucks, Walgreens) will send you advertising notifications, but if you disable all notifications for the app because it's spamming you, you don't get notified when your car arrives, your drink is ready for pickup, or that your prescription has been filled.

It would be nice to be able to simply switch to a non-spammy vendor in that case, but that's not how the market works in the US.