I for one definitely want to see my legs, yeah you don't spend much time if any looking at them, but KNOWING they're there is what matters. It's the same as a racing game that doesn't have any damage: yeah sure, it's about racing not crashing, but you notice it, it's this horrible nagging feeling that you're not driving a car, you're driving an invincible brick
One of the best features of ArmA2 imo (and back to OFP as well), it made you feel like you were a soldier walking around in the world, not just a remotely controlled turret that shoots things, which may not matter if the only reason you play is to run around fragging everything that moves, but for immersion it's a must.
Can you imagine if there was no sky box? Sure most of the time you wouldn't notice, but you'd always
know that there wasn't, it wouldn't feel real.
The more immersion the more you move to the right of this scale:
I am:
Sitting at PC - - - - - - - - [O] - - - - - - - - Shooting Germans.
The further to the right I can get the better.