It seems I often don't get stuff in my inbox that should be there. Like direct replies. But honestly, I'd also like to get notifications for sibling posts or replies to replies and so on. I just want to subscribe to that discussion.
Another thing is that sometimes eternity forgets where I was doom scrolling, and it takes me forever to get back to that point. I probably just clicked away from the feed or closed all my apps.
Edit: Maybe with a bell button. It's simple and gives control and it's okay to not use it. In the settings you can say also enable the bell when you like sum. Afaik activity pub supports granular subscribing.