It amazes me that iOS has had this from day one, third party Android vendors including Samsung, Sony, and HTC have all created they own solutions, and yet Android made it to the letter "P" still without this feature.
I just upgraded to Oreo this week it remains to be seen just how many emails and messages I'm going to miss now that I can't see whether or not I have anything unread in these applications. It's frustrating.
The current trend is to do away with these distractions and allow people to focus.
What you're arguing for is the exact opposite. You're asking for the distraction. Persistent reminders that you are neglecting a particular App.
The Oreo model means I either have to have notifications (which are actual distractions) or I simply have no clue if something needs to be dealt with. For a device designed for communication, this is important. It's not a distraction, it's literally the reason I have the device.
So maybe Apple isn't as bad at notifications as some would say ...