Do other MMOs have the Ability to Fly

That answers my question.

Is it still a thing to blame everything on the engine? By the way I don't think that is true.

Not that it's a big deal, but I seem to remember getting flying mounts in the burning crusade expansion and that was 2 years after launch.

No real depth at all is there (i.e Z axis)? Hence lack of swiming or more than ankle deep water.

Hero engine can most definitely handle flight, as can pretty much any modern 3D engine, I see no reason why it should not, so that reply was just stupid trolling, unless its poster can provide some link from where he got this ridiculous info.
SWTOR most definitely has a working Z-axis, otherwise there would be no jumping in Huttball, not taxis flying up and down etc (also, no falling).

As for Burning Crusade flying: Yes, but Burning Crusade included a new world and flying was only possible in that new world. It took much longer for the old world to be remodeled to handle flying.

Actually, you have no supporting evidence. I did a search on the Net concerning the Hero Engine and Flying and could come up with no supporting data/documentation stating that it could handle free movement in the Z-axis for flight purposes. Just because you can jump and climb does not diffinitively support flight. You make an assumtion and then accuse people of trolling. One could say the same about unsupported statements regarding the Hero Engines capabilites. Again, with no supporting evidence we don't know. Right now the only z-axis "flight" movement supported by the Hero Engine seems to be for use in "taxi" style movement.

There were no flying mounts at TOR's release because there were no flying mounts in KOTOR ... just like there were no flying mounts at WoW's release because there were no flying mounts in Warcraft. WoW's flying mounts were introduced 2 years after launch in the BC xpac, and they were not usable on the vanilla continents until the Cataclysm xpac another 4 years later. TOR is barely a year old and still cutting its teeth.

While I miss WoW's flying mounts (especially for farming) that game shrunk incredibly because of them. By Cataclysm movement speed had exceeded 400% with perks. Now that's ludicrous speed! OP made a valid point that (in particular) datacron hunts would diminish in value with flying mounts. To my knowledge (and I don't profess to be a know-all) WoW is the only MMO that incorporates flying mounts.

EQ2

Cool! There's two ...

To all the players worried over flying travel mode, Its all very really absolutely amazingly incredibly simple:

Don't like flying mounts don't use flying mounts.

Nobody else will care.