Not a big deal in linear games as there is only one right answer and its really not fun to have to redo the last ten minutes because you were clipped by a rocket 3 feet from the savepoint.
For more open games or games where defeat isn't instant gameover there needs to be a control to prevent players from reloading the moment things go even slightly off course - unless you want everyone to have the perfect ending all the time.
Saving systems and defeat have a massive knock on effect in how a game plays out. Not from moment to moment, but how the game plays long term.
I'm not sure I like the idea of only saving at "save areas" either. What if i want to quit without losing progress? Would this be automatic or do we have to talk to someone/activate the weird floaty stone/go to the menu etc?
And yes - this is important. I cannot count the number of games I have been unable to complete because of stupid saving mechanics.
As a side note: For the love of gaming make sure the player can't ever get themselves into a deadend situation that isn't instantly recognised as gameover. There is nothing more frustrating than wasting half an hour before realising you cannot progress because of a mistake made earlier that you cannot correct. Its rare but it still happens
