No time limit, people zombie things till it dies no matter how difficult, have a time limit, nothing but a zerg fest to kill everything as fast as possible so you can kill before time runs out. Gotta love how terrible it is either way.
Sounds like it is time to disable combat raise!
That only helps some events, things like Delve NMs outside were not done, and still are not done, by raising people, if someone dies you just have them HP and come back, that only helps instanced events, and even then... you make fatal mistakes literally game over for the party.
Outside NMs are pretty special in that regard. HP'ing in HNM, Sky, Sea, Dynamis days was either impractical because of the time taken to get back or because you couldn't re-enter an area anyway. It almost seems like they went out of their way to stack waypoints on top of most Delve NMs.
Such a thing would ... possibly help many events, but they'd have to rethink every relevant fight, and they won't be doing that any time soon.