At some point, somewhere in the last 15 years or so, people just stopped making zones with neutral mobs in them.
We have been (and still are) hard at work to bring you more neutral mob content to help with the struggle of leveling.
As someone who has pretty much always played neutral aligns, I like to think of it like just a higher difficulty level for the game. Wimps go good lawful, decent players go evil, but the pros go neutral!