Any sort of delay or buffering can affect you very negatively (see: https://mux.com/blog/buffering-reduces-video-watch-time-by-4... and https://mux.com/blog/rebuffering-the-most-frustrating-and-fr... )especially now that most YouTube users no longer are used to it.

Sure, you could do something like you mentioned, but doing this for every single video is not likely to go well. But very clever! And helpful, I'm sure. Not a true solution most of the time.

I do very much enjoy the Chrome side-scrolling dinosaur game that appears when I'm offline, but I don't enjoy it more than once every few weeks :)