I appreciate your opinion although I disagree. I think once you click onto a chat (which is a user choice) then you expect the notification to clear and not estimate how long it takes you to read a message. Especially when it’s a chat (as opposed to say, a thorough conversation on a topic).
Think of your (not-so) friendly WhatsApp group messages, sometimes you just want to quickly tap in, see if someone you actually care about 
wrote something and then exit.
Is there a simple way for others to at least tweak this setting at all?
Thanks for your time & attention!