Even with decent containers, making software that's good enough for everyone to use is considerably more difficult than making it for yourself and a few friends.

It's okay to do things that don't scale at all, and also okay to make a proof of concept and let someone else worry about scaling it up.

That said, you might want to look at Chromebooks and the Windows and Mac app stores to see what's going on with containerization beyond mobile. (Also, web browsers.)