See - messengers use push notifications to let you know about messages from humans. Most users of messengers get (understandably) upset if they don't receive notifications for incoming messages.
Note that you can always block notifications for apps you chose. The problem here is the other way around: You do want notifications, but even though you disable battery optimizations and some other things for the app you're using you can't get push notifications to be delivered reliably. That's a pain.
Note that you can always block notifications for apps you chose. The problem here is the other way around: You do want notifications, but even though you disable battery optimizations and some other things for the app you're using you can't get push notifications to be delivered reliably. That's a pain.