endipatterson | Interrogative pronouns

I was wondering why LFN needs seperate words for the interrogative
pronouns when it would be possible to use "ce" and a noun:

ce - what/that
ce person - who
de ce person - whose
ce elejer - which
ce tempo - when
ce via - how (not sure if this would mean how or which way)
ce dirije - which way (direction)
ce costar - how much (price)
ce cuanto - how much (volume/weight)
One could be more specific here:
ce volum - how much (in volume)
ce pesia - how much (in weight)
ce loca - where
ce rezona - why