@Deckard_Red
"...But it autosaves constantly, if you agree that you shouldn't be able to quick save in combat then I can't really see a time when the latest auto save won't be fine..."
Not during main missions, not during certain missions, and sometimes not during other random times. For example, the Kett base on Eos. It saves at one spot and that spot is practically the beginning.
Fought my way all the way to Invictus after several attempts mainly due to the enemies having improved everything including AI while my squad somehow seems dumber (oh and them literally being able to appear out of thin air) and couldn't save. Had to do that whole half again.
There's a difference between not saving during combat and not saving during the whole duration of something that can take hours to do despite the fact that there's plenty of times no combat is going on so I can't see how you can compare not saving during combat which can be like a 15 min skirmish to not being able to save during a mission which even at a half way point is multiple skirmishes that are 45+ mins long.
In short, me being okay with not being able to save for 10 to 15 mins does not mean I should be okay with not being able to, and the game not doing it, for 45 mins or longer.