- If you want to play in Story mode, resting would be easy and cost maybe 10 food points.
- If you play at medium difficulty, resting could cost 40 food points.
- Hardcore D&D stetting might put resting at 120 food points.
- Nightmare mode and you'll need 240 food points for a night's rest.
I agree with others ... this (and many other things) should certainly NOT be defined by general dificiulty settings. :-/
Absolutely it should.
If you are resting after every battle you want easy mode. I couldn't imagine my spellcasters being able to blast through all their spells for every battle -- it would trivialize combat. (For reference I've never done more than 5 long rests in any play through and went through two with zero long rests.)
If you want more of a challenge you need to manage your resources, but the reality is not everyone enjoys managing their resources.
Tying the number of long rests you can have to difficulty is absolutely the way to go.
