-1 for the shop part, even though it's just a cosmetic. Maybe there will be a quest or whatever for every legendary in the future, who knows
+/-1 for the companion itself. It's a bit sad that the sync must be in slot 1 if you are hunting, but tbh: If the companion would be only visible if you are not on your mount, it would be completely irrelevant, because no one is hunting for real without mount. And if it's visible even while riding on your mount, it could cause lags for some older, weaker devices
I personally wouldnt be against it to be implemented in the future, but I think there are more important things on the list.