You can always do that manually when creating the post

True, but you won't. You'll click the button that automatically populates it instead.

I do think AI could enforce having a quick summary at a glance... if it was reliably accurate. But again, why do that and prevent traffic from going to the people who did all the work

Yeah, that's why I don't like the summary idea, because then even fewer people would click through. It also requires opening the comments which also most people won't do.

I guess fewer people click through with less sensational headlines too, but at least they're not mislead.