Honestly, I just feel like putting it forward that far too many people put far too much value on AC...
Feel free to corect me but it seems to me that core meaning of this topic is to give us option to play it the way we want to.
Sure Shadowheart can be played as divine rogue ... but if i dont want divine rogue in my party ... if i want frontline high AC tank i see little to no reason why i should get used to anything else just bcs "this is not the way this kind of cleric is usualy played".
I bet you would also dislike if your GM would demand you to take 16Dex and demand that you will keep Mage Armor active all the time.
Bcs in his opinion that is the way Sorcerer is supposed to be played and in his eyes you are putting too much value to sustain a hit instead avoiding it.