I main WHM and I don't think it is the same as before. It heals more and it's more versatile. What have changed is how you play it. You need to focus more on heals, you need to manage your mana more carefully and you need to put the new tools available with the expansion to good use. If you keep thinking like in Stormblood you will have a hard time. At least it is how I see it for my class. Now it is capable of more and imo more fun to play, but basically it is a different play style.