This is a useful for playing around with code on a commute or making a tweak to existing code. I don't believe they think people are going to be writing entire

This is a useful for playing around with code on a commute or making a tweak to existing code. I don't believe they think people are going to be writing entire large apps with this. I used to use a program called OnboardC on the Palm Vx some 13 years ago that compiled PalmOS programs on-device. It had its uses, as does (say) the ConnectBot ssh client for Android. Sometimes you need to make that quick change on the move.