Healing restriction

[tenchi]

Think of this as a war game. In a real battle, you'd have a field medic healing you while you kept him safe.

If you told an army that there are no more medics, then you'd have an army that wouldn't fight. Similarly, if you say "you can only heal this much", you've got a weapon without a reason for being there. You can't even say "you can only heal this much per person" for the same reasons.

It's much better to heal as much as possible and stand a fighting chance than to lose some battles. Not to mention that they're most useful when you're trapped in dirt.