No doubt useful, I just find that it’s failings are whisked away as “you don’t need to worry about source control because it won’t work!” It prevents users from learning things that would make their lives easier because it can’t do those things, it gets them stuck at a local optimum. It’s great for what it’s great for but as soon as you leave its usefulness domain jupyter becomes a burden to integrate even in a simple way.

You can use it with source control, I do it for about 18 notebooks I use on a daily basis:

https://github.com/kynan/nbstripout