As long as the story is convincing the characters that resting is bad then advancing the story shouldn't be tied to resting, IMHO.
On the other hand tho, thime should pass naturaly ...
Yes, you may "not yet have all your hp and spellslots used" ...
But 24 hours is 24 hours ... no matter how much you "dont want to rest yet" ... i dont think we should be able to squeeze ten day march into single Long Rest ...
And therefore, it seems quite logical for story advancing to be tied into long rests, after all they are the only way to measure time we have. :-/
