Completely this. While I do understand that from a developer side, they want to have control over the engine, from a user side, it's all about how convenient it is. While many basic Renpy features can be recreated in Tyrano, VN Maker, Unity, or whatever engine they make, it is often time consuming and buggy, just like we can see it numerous times, while Renpy is usually rather stable as a whole unless you want to make some great sandbox game. When 90% of the games have quicksave, skipping, rollback, easy options access, numerous save slots, ability to skip unseen text, you'll get used to it, and if those don't exist, me as the end user will miss them if they aren't present, and going to be bitchy about it, maybe to an extent where I give the game altogether.