Less, more, fewer are comparative adjectives/adberbs.
Am I allowed to say
I like eating durians because they are less pungent.
Why is there so much less (for non-discretely countables) snow today?
Why are there far fewer (for discretely countables) students today?
Yes, provided you have either an implied or prior situation for comparison.
Therefore,
Miriam: I love eating petai peas.
Aminah: I like eating durians because they are less pungent.
For the following two sentences, there are respective implied pre-existing situations available for comparison.
Why is there so much less snow today? (implied comparison with yesterday or the last snow storm)
Why are there far fewer students today? (implied comparison with yesterday or the last time the class was held)