One thing I've noticed on iOS is that often app updates seem to reset my preferences. Not every update, of course, but I notice notifications months/years after I am 100% positive I disabled that category previously.
iOS has different channels in Live Activities and "Time Sensitive" notifications. Live Activities are hard to miss because have very different style of UI (meant for active ongoing things like "current sporting event" and "pizza delivery tracker"), but most users don't notice "Time Sensitive" to take advantage of them until they turn on Notification Summaries. (Notification Summaries collect most notifications into a once-every-so-often, as you choose to schedule it, "newspaper", but Live Activities and "Time Sensitive" still show up immediately.)
Abusing "Time Sensitive" is also a "time to give a bad review" case for me, too.
What is immediately worth a one-star review of an App for me (including the corresponding comment with the reasons), when it uses it "Important" channel to send me some ad or other stupid notification like "Please rate me".