A few lines before the reveal I thought of this a a product sold by business, then right after resuming reading again felt the old "ahh, missed the chance again" when you laid out you're already planning it...

But really, a platform that allows one to do all levels off apps in this way where one can cleanly reset their side effects and effect on the system, and the app is exposed just as an icon, not a folder of source files, could already be possible and could lower the bar of starting vibe coding to the bottom