Interesting.
Thanks for sharing that info Bighatbulls .. I have have had Maple Fretboards before, particularly on guitars, Telecaster or Jazzmaster style guitars, I never did oil them. I never bothered to research the info though either so it's interesting to learn.
Jolly boy, Maple Fretboards aren't always coated, I've only had one which was and the others have been uncoated.
Personally I wouldn't want a furry feeling fretboard, it's really not necessary and not beneficial in any way, but you're right if a fretboard (any type) is coated it doesn't benefit from oiling at all, most aren't coated though they are usually raw, at least the ones I've had.
To be honest I sold my Jazzmaster because I wanted to cut back on guitars and the Jazzmaster had a gloss finished fretboard which annoyed me especially when doing a note bend or vibrato it just was really awkward, even though I liked everything else about it, I discovered I really don't like coated fretboards.
Saying that, I don't want a hairy fretboard either, and I think if it's specifically noted on the lemon oil bottle itself it's there for a valid reason. Otherwise I have nothing against using fretboard lemon oil and will always continue to use it appropriately on either Rosewood or Mahogany Fretboards. I also give my Bridge a light wipe with it.
I've heard people saying strange things like if you use lemon oil your frets will come loose and fall out and other strange things, although I've never actually heard of it happening, and I think it's more of a fearful type of concept, I mean ok if you soak it and saturate it may not be impossible for such things to happen, but it's unlikely especially when used properly, and I think there's more chance of harm to the timber if it's neglected.