OK SO.
I am not a beastlord, nor have I ever even played one, but I do have a beastlord friend or 2. The stance change DID go in.
I dunno opinions on whether it's good or bad, but I do know - apparently it not only shares HP with the warder, but it also shares HP with the Runic 1 swarm pets, which is a Very Bad Thing™
Any mob that has a remotely decent AE will instantly drop the beastlord from full health down to dead. Like literally 100 to 0 without any pause. I can't imagine that this was an intended effect of the change. I could understand the sharing HP going both ways with the warder, and I can also understand why it would upset some people. But this seems like an oversight, and a very painful one at that.