I don't mind only getting 7ish hours out of a unit. I mean people complain about charging it every 2-3 rides or so if you ride a lot but most people have to charge the cell phone every night and don't even think twice about it.
If your a person who rides long distances and out on the trail for days on end yes, it would be super annoying. But really short of that anything I can stretch over 7 hours will do me fine if I would change my power settings. I just don't see this as a huge complaint or downfall of what we expect this little computer to do.