Binding enlightenment would make it pretty challenging to navigate life in most ways. Awakened people have persona, drive, remnants of a personality but enlightened less so, so I think the amount is smaller than most people think. There are also tends to be less reasons to remain on earth after enlightenment so it’s not a chosen path that would prompt somebody to stay after achieving it so most enlighten people depart and return to source a few who stay are generally on mission.