Yeah, but why save scum when rollback is faster? Why even hide it behind a cheat? I often use rollback to see what the other characters are asking me before I pick one of the choices I'm given, if the story is boring enough that I skip everything and just watch pictures. Here it is, but I can't do that (out of the box anyway), because someone decided a standard VN feature should be a cheat.
Summertime saga is not that tedious to play, I'd argue. If you play it over again you just skip and remember the choices. There's also one minigame in it which doesn't require me to spend two minutes solving a 10x15 memory game, taking me completely out of the story.
Edit: okay there are more minigames apparently but I played it last month and forgot them, which means they are not annoying enough and not good enough to remember