From the Beta release notes:
"The Heal spell is no longer flagged to accept the Heighten metamagic."
This might have been a reasonable compromise at one point in time. However, did these guys ever hear of Update 11? From THOSE release notes:
"Metamagic feats can now be applied to specific spells. Players can select a spell on a toolbar, click the right mouse button, and set the metamagic feats that apply to that spell."
U11 gave us the perfect solution! You would NEVER waste unneeded spell points on Heighten, by using a slot set to "never Heighten". And you would NEVER have a crappy offesnive DC, because for offensive use you could use a separate slot set to "always Heighten".
Now, they have decided to nerf using Heal to nuke undead by forcing our save DCs lower. Was this an overpowered tactic or something? If not, then they have done nothing but take options away from players for no good reason I can see. Why the nerf?