Players have to have some other means of regaining lost health other than resting. I would even take a healing spell that inflicts negative stats as a trade off instead of coming to the boss door and being forced to turn back because my party has low health but instead of using the last of my potions and spells to help me push through and worry about restocking on the other side I have to run back and rest then come back again. But if the player can rest anywhere then it can go all NWN 2 in which I can nuke and room then drop on one knee for 5 seconds, nuke a room rest and repeat.