Micah Sweet
Level Up & OSR Enthusiast
Regarding the spellbook issue, you can't blame the game if people don't apply the rules.I've never seen it imposed, there are clear workarounds if it were, people never actively state that it would be a good challenge for the group.
In my experience it was not enough to dramatically affect my capabilities. If people were dramatically affected by uncomfortable sleeping situations (and stacking levels of exhaustion, the most common penalty, kill you pretty quickly) humanity would not have survived.