It’s the last phase. It’s time to break everything in the name of fun, not ruin everything. Balance is well and good, twist the knobs, change the numbers, whatever. But completely gutting how a spec plays? It’s not the time for that. If anything, who cares about balance? Focus on making things fun. If healing mages are too strong? Make other people stronger! Make the bosses harder, whatever. But don’t take away fun things.
You’ve been offered dozens of ways to fix healing mages that would both be fun, and bring balance to the force. And you’ve chosen not to. You’ve deliberately decided “we don’t want mages who heal to have any fun.” Don’t do that to us.