Fellow HC player
He's right, when dealing with lag and disconnections you have to measure the damage (taken) over time and build on effective health to withstand it. In D2 it meant lower damage and high vitality, in D3 it means higher mitigation and lower MP. In other terms, you build for the highest stress, and consider lag and disconnections as part of such stress.
I'm not disagreeing that you can build to prepare for such disasters such as a disconnect. I'm disagreeing that it "adds to the fun". It doesn't. There isn't anything fun about "OH SHI- I DC'D PLZ LET ME BE ALIVE PLZ LET ME BE ALIVE PLZ LET ME BE AL- NOOOOOOO IM NOT ALIVE!!!! NOOOOO!!!!"
Even if you DO live, it's a stressful experience. It's not fun. Love HC, but "building for lag" should have never been a mandatory part of the play style, since lag isn't part of game, it's a technological malfunction completely outside of the ruleset and gameplay of Diablo 3.