Yea, from how you made it sound it seems similar to how it ended up being in nier - make a choice that does seem like it'll end the game, but really it's probably not very serious - credit roll, hope you saved recently. It would've very much benefited from simply autosaving at the correct time.

Imo it kinda depends on what kind of ending it is, if it's still conclusive but maybe a bad end, that seems alright. Just if it clearly leaves me unsatisfied I'd be annoyed. I'd still really prefer just having a reload option, but I'd also rather game devs stick to their vision, just like fromsoft ganes really don't need an explicit easy mode, it makes sense they'd also stick to this if they want to do it. It'll be great for some people, and others will hate it, and that's fine.