I brought this up in another thread. Seasoned players know how bad crown store pets are. Even running one in VMA is a poor choice. Try running one in a trial without it being brought to attention. The lag caused I assume is a reason they aren't allowed in Cyrodiil. Follow mechanics maybe?
The fact that ZOS sells these things when their own code can't support them is bewildering. Now they want to let people buy a class, not a pet, based on this. Fengrush brought up a point a year or so ago. He said ZOS is releasing things they already had. This fits that theory. It's a class that most likely is based on existing character models, which is fine. It's just that this model is based on some mechanic that may slow down the game.
Some people can say that Zos wouldn't do that. Look in the crown store for non-combat pets. So the question isn't if they would release it. But would they release a full expansion with that flaw. If people buy this expansion and suddenly raid groups won't let them run it due to lag. Zos will say it's play the way you want to play or whatever. It's the solo class. So they beef them up to make them more appealing. You get OP Wardens saturating Battlegrounds. Zos has a problem balancing between pvp/pve. Wait for the pvp/pve/bg balancing issues.