If I know that I won't ever hit a brick wall and be unable to progress then I know that I'll win the game and I might as well not play it and just pretend I played it and won. Not like any other outcome was possible.
Sorry but the object of a game in my oppinion is to have fun. A player should want to play your game because it's fun. That really should be enough incentive.
And why stop there? If the player needs to take more than one hit before dying in Metal Slug to beat a boss, then that's the player's choice.
See thats a completly diffrent thing. Thats making the game easier by way of just making it easier.
Say for example you're playing a rom of a game. Is it inhernetly less fun because save states exist? You don't have to use them. If you personly think it's cheap to use them then don't. Just save when you're heading off to do something.
Save points effectivley punish the player for having a life outside fo the game. I should be able to stop playing a game when I feel like it and not be punished by having to redo anything.