I see a lot of people saying that it would be a problem for replayabilty and farming armour, I understand where they're coming from but I would have to disagree. The incentive to play should come from the activity being fun, not the armour farming. Say older content gets removed or players lose interest, having the ability to transmog to these sets is nice and allows players to show that they've been around since/completed said content. The solution I have in mind would be, high end activites like raids will drop with a higher overall stat roll than obtainable through other content. Not crazy enough to the point it's necessary, but there for the players that like to min/max their gear. Another alternative would be to have an extra level similar to what the season pass does. For example, you either have some easy content level x armour transmogged to look like raid gear, or you farm raid gear and get the roll you like but instead its level x + 1 allowing for a slightly higher mod limit. Obviously just my opinion though, but I do hope to see all armour available as transmogs eventually, personally I play content for fun and to hang out with friends, and not so much the farming. It would be nice being able to look cool and be powerful, even when my friends aren't around and able to run raids.