Pet peeve, games that won't let you save

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.

I wonder what the reason for this is?