I know there many are other post on this topic. But I wanted to make a specific point on this topic. That deserves it’s own post.
First, who is going to buy (gems with money) two heavy sets of the same armor? A very small number of player are going to do that with money converted to gems.
Our characters class/race is are already limited by which armors we can use, on all our characters.
Third, at most players will only have 3 total characters out of 8, that uses the same class of armor.
Anet will not lose much money by making Armor Account Bound!