Time that could be spent getting "legendary" gear for PLD would be better spent leveling a half-assed BLM (etc). For less than the time and effort that would be spent making PLD "useful," you'll have a job that is in-demand, useful in most (if not all) situations, and will generally get you to where you want to go that much sooner.
It's not just about the time, it's about the return on the investment of that time.