I wish all games would just let you save whenever you want to! Why is using checkpoints and auto saves so common?
At least add a quit and save option if you want to avoid save scumming.
These days I just want to be able to squeeze in some gaming whenever I can even if it's just quick sessions. That's annoyingly hard in games that won't let you save.
One of my favorite things about the DS family was its pick up and play nature. Sure not every game would let you save and quit, but you could just shut the lid and come back later and everything will still be right where you left it.