Barry's death is one of the best deaths in comics. Sacrificing himself to save the last remnants of reality is so damn epic. It was important and meant something to the larger DCU. I also think Jason's has just a big impact but on the total different side of the spectrum. A character turned into a cautionary tale instead of a heroic sacrifice, you can only do that once but DC mucked that all up by bring ing him back, same with Barry.
The problem with writers now is that they think that death in and of itself makes an epic story. If a character is going to die they need pathos, some important story reason for the death/celebration of what came before, and a blaze of glory of sorts. The last isn't always needed but it really makes an impact when a character goes down swinging like Barry, Supergirl, Doc Ock, etc. I think if Bruce was to ever really 100% die, he should get shot in an alleyway or just die of old age in one. The pathos and full circle of his story works for both ways, the first representing the same way his parents died and that crime isn't something you can just stop and the second is a more hopeful spin that Bruce's mission was worth it in the end.
Just punching someone's head off in the middle of a fight without buildup, dying off panel, or a sudden shift to villain that needs to be killed by a hero are lazy go to story ideas. They have been done to death, it doesn't even feel like they are trying to capture lightning in a bottle but rather manufacture bottles with a cheap lightning logo on the side. I'm tired of the same ideas being done over and over again. It's more of the same attempts but worse each time.