Honestly, as I posted over here–
I really do think that essences, at the very least ranks 1 & 2, should be account wide. Thinking about having to re-farm them on top of EVERYTHING ELSE if I ever end up changing mains just sounds daunting to me having to re-unlock the basic essences. I would be fine with having to re-earn ranks 3-4 but at least having the basic essences would be kinda nice for alts or if you change up mains.