User blog comment:Timeoin/Is 'Redguard' the next Skyrim DLC?/@comment-76.254.51.192-20130108171214/@comment-4057437-20130110003046

That water was a key factor in playing Fallout New Vegas on hardcore doesn't make the other factors unimportant. One could die from starvation or even lack of sleep. The weight of ammunition was more important than even water, as water wasn't all that rare if one didn't mind a few Rads.

The change in the way Stimpacks worked was also very important, as well. If healing potions worked over time, many strategies would have to change.

Finally, Bethesda could factor in surviving in the cold. Having inadequate clothing in cold areas could sap one's stamina. Once the stamina was low, it could also drain health.