Maple doesn't NEED to be lacquered. The lacquer just stops it going grey.
well aware of that but since maple keeps being described as harder than rosewood i can only assume thats because of the percieved hardness that lacquer gives maple fretbaords - because, as a fretboard wood, its one of the softest!
maple does need a finish, even if its just oil and a bloody thorough fine sanding because it will go grey as soon as you touch it if it has nothing on it but more importantly it will also become rough and be unpleasant to play on - oiled necks need more maintenance like rubbing with wire wool and an occasional re-oil to stop this!! if looked after a oiled maple neck can be fantastic, if not cared for properly it can become quite unpleasant
This is the difference with other fretboard woods we have mentioned, they might need an occasional rub down and re-oil but generally they are hard enough to resist finger wear in a way anything less than lacquered maple can simply never be.
we seem to be getting wood uses mixed up. Compared to most body/neck woods maple is one of the hardest and brightest but compared to fretboards woods it really isnt. so in some situations maple does add a lot of brightness - but not necisarily when its used as a fretboard wood.