Gear doesnt exist in a vacuum. The reason we dont meld our gear is not complexity, because as a whole, Yoshi is right, people dont generally do complex stuff when they dont need to.

Gear exists in the context of content, and if the content doesnt ask you hard questions that you answer through proper gear optimization, its a complexity just for its own sake, and should be done away with.

Current dungeons and raids never require those melds or extra stats. In very few raid encounters do you ever hit the gear cap. I have successfully done, within 2 weeks of returning after leaving in 3.1, Baelsars Wall + Sohm Al hard under their item limit. (none of the group had more than 228), and it was not hard.

The content is too easy for the gear complexity to matter. Make the content numerically harder, and people will adjust. WoW had a MUCH more complex gear system during its prime, and 11 million players adapted.