you can do that in just about any game in the universe... including wow pre-flying.

they have given no word or intention of flying mounts... so I don't see the point of this comparison. they did not take shorcuts for launch. intentionally finding flaws outside of the normal scope of operation is not the "ah-ha" of bioware skipping steps.

you can still fall through the world in WoW. you can still climb up in the non flying area's an see untextured areas. just because one game does something does not mean you can step into another and expect the same result.

that would be like me loading up WoW and accepting a quest, and then saying,

"looks like WoW wasnt ready for Deathwing, there is no voiceovers in this expansion, blizzards taking shortcuts"

Find "pics" of broken terrain from a normal gameplay standpoint, and then delete them.