There is a physical limit on how thin we can carve the fromt to back. If it goes too thin, the truss rods will pop out of the back, making a very sad day. Usually, we are about .9 inch thick. We can shave it down to .8 safely, but keep in mind that the thinner the neck, the more reactive it will be to humidity changes since it will be less massive.
I know not everyone is Stanley Clarke and Mark King, but these guys play with very narrow necks. I think it's because they are less fatiguing to play and with a shorter distance to travel between strings, it's faster to switch between them. Of course, misfires are more likely the closer the strings are.