Lightspeed isn't that great because 1. It uses up MP anyways compared to Freecure (PoM with lucky Freecure procs is better imo) and 2. It's not exactly instant, as you still have to wait for GCDs and for this solely fact it's quite annoying, I only use it for emergencies or if I need to chain nuke. PoM is still more reliable and useful in my honest opinion.
WHM's regen is still stronger than AST's. Overtime you can tell the difference. Medica 2 is 20y range and just for that sole fact it's extremely more convenient than the 15y from AH specially in fights where you have to spread, like A1S.
Reason ED is on 40 sec cooldown is because it's our only single target emergency heal. We don't have an instant AoE emergency heal like Assize. So in my opinion, the recast times are irrelevant. You are comparing 3 emergency heals to 1 emergency heal on AST.
Ewer is random and not 100% reliable while Assize is there at your fingertip.
I somewhat understand about the uniqueness in each job but saying AST does things "WAY" better than WHM is not exactly true. Level both jobs at 60, do end game and see it for yourself.
Edit2: One thing I could agree with would be Synastry as it's more yummy than divine seal but that's personal preference. :p Even then I'd say they are pretty well balanced based on recast time and potencies.
