Are you really oblivious to the fact that char sheet dps means absolutely nothing in comparison to real dps? I'll give you 10mil gold to find a video of a DH, Wiz, or WD doing azmodan mp10 in less than 10seconds. You can't do it, because no other class gets even close to that REAL DPS. Hell, I dont think you'll be able to find a ranged do azmo MP10 in under 20seconds(over twice the barb record).
Well, it's a barb, right? Why should a barb kite? Maybe only if he is not prepared for the mp level he chose. CC immunity is necessary since he has to tank. He can not kite away and do damage from distance because he is not ranged. It makes sense to me.
I'm not asking for barbs to have to kite, although I'd argue they are VERY good at kiting due to their nados trailing behind them. I'm saying that they should either have to deal with the affixes like the rest of us, or do less damage. Right now they get the best of both worlds. They out-gun glass cannons by a long shot and are the tankiest class in the game.
Naturally, DHs have much higher DPS than barbs so that DH benefit much more from LS than barbs do.
Again, you're basing your entire argument over the completely false assumption that char sheet dps is a meaningful metric when comparing classes. The reality is that barbs actually benefit significantly more from lifesteal because they have higher effective dps.
As for lifesteal, DHs can get even more LS:
3% on weapons (6% if dual wielding) + 15% on Gloom + 3% Nether Tentacles = 23%
3% on weapons (6% if dual wielding) + 3% belt + 3% Bloodthirst + 9% Rend-Bloodlust = 21%
Are you seriously trying to compare a Dual wielding DH using NT and gloom to the passive lifesteal of a barb? NT kills your dps, rend boosts it. Dual wield on a DH kills your dps, while dual wielding on a barb is actually the highest effective dps build in the game... and gloom is an active skill that DOES NO DAMAGE AND COSUMES RESOURCES. You are out of your mind to try and argue that is better than barb lifesteal.
Just compare vault ToC to run with the wind. Both skills are mobility skills. Run with the wind can do a huge amount of damage in a run. Vault? Hell no, they nerf the !@#$ out of that because mobility skills weren't supposed to be heavy damage dealers. There is a huge double standard when class changes are made.