I love how people call the "non jumping" argument baseless.......

You want baseless? ok... I have played 20 MMORPGs pay and free that allowed free jumping, and guess what people did in every single one of them?

Bunny hopped (annoying)
Kangaroo fighting (really annoying)

and in all 20 of them, jump was not really even needed, there was nothing in any of them that really required jumping, it was just added for no real reason.