To be fair, my father tends to make messages quite incomprehensible by adding irrelevant information all over the place. Sometimes going on for multiple screens while it could easily have been a 2-3 sentence message.
Sadly I think AI would even be worse at picking up what information is important from that. But I understand why people want it.
As for very active groupchats, I am not gonna read +25 messages a day, but being able to glance the gist of it would be awesome.