Everything else has moved to shared account status, gold, AD, Trade Bars, etc....
Why not Refinement? It would be a HUGE QoL change that would be easy to implement.
I know I would play more characters if they had access to a shared account refinement pool-->that would mean I would refine more things for more characters--->which means I would need more P&C Wards (you know, those things we actually use ZEN for?).
What do you say, devs?