The thing is the comments made by "these players" are mostly from people that only have played mmos that have you restricted to one class only. When presented with an mmo like the Final Fantasy's they can't seem to find the logic in having multiple jobs/classes geared up.
So to them if gearing up fast looks to be bad for the game and throw out those comments that if people gear up fast..then there's be nothing to do.. So I doubt that if tomes where restricted to classes, which I believe was thrown around on some threads years ago, will be a big cause for concern of people unsubbing.