I have seen them around the Fediverse and on Reddit and if implemented properly it helps greatly.
I don't know about others but I appreciate a good TL/DR bot to help determine if I want to read the full article posted.
is this something that has been considered for communities like news? I know I would like to see this.
A working example seems to be: https://lemmy.world/u/tldrbot
that used this under the hood: https://github.com/SleeplessOne1917/lemmy-bot