A hardcore yes! The most basic reason is that a main purpose of correspondence games is to fit into the interstices of our lives. This means, at the least:
a) being able to consider the most recent board position of your game in your spare time whenever you have the desire (which includes seeing your opponent's move ASAP if that is your desire)
b) being able to play a move once you've made your decision, in the way that best balances time management in real life and time management over the clock.
It's not the world's easiest thing to give extended commentary or to otherwise make use of the review/analysis tools when away from keyboard, but it would be wonderful to be able to do a) and b) when one has at hand a phone, but not a computer. Portability for the simple functionality of playing correspondence games is much more important than making anything else about OGS more portable.