I've messed around with coding on mobile and basically came to the conclusion that it's only practical for emergency situations or making very minor tweaks. But in an emergency situation it can be extremely valuable to be able to make a quick fix while you're traveling without a computer. Even if it is a little tedious to work on the device.

So for that reason I'm happy to see mobile development tools being made, even if I don't plan to use them day-to-day quite yet.