Not sure where do you get the +13 for the barbarian.
I was high on crack for the most part last night. The numbers are much lower than that damn SorO was trying to flop things in reverse but the point still stands.
What I don't care about and you seem to is the number of attacks granted by BAB is allowing the Barbarian to sometimes deal more. What I really don't fracking care about is how much you tweak the Barbarian's damage to prove some bullshit point I'm not even talking about. My point is the tweak favors none dedicated class's chance to hit more than the so called dedicated.
Further the repercussions of allowing those none dedicated classes to damn near always hit you are opening a can of worms leading to other classes replacing the need for a dedicated meleer in the first place. This has squat diddle dick with the Barb having FOUR attacks per round.
Take this scenario since both are level 20.
Balor lands the Surprise round and summons another Balor.
Initiative is called.
Rogue wins (higher dex), he shoots one in the face twice and kills it.
Barbarian is second (PCs have better init checks) and charges the other Balor dealing 9,999 damage or wtf ever.
After combat the Rogue heals the Barbarian for being dumb enough to charge the huge creature on fire.
After that the Rogue searches the room for traps.
After that the Rogue disables the Implosion Trap on the vault door.
Barbarian is sit of waiting and hulk smashes the door the rogue could have easily picked, bypassed, or chipped his way though anyway.
Who was more useful in combat? Neither one. Sure you can fine comb it, the Rogue didn't get hurt, the Rogue used ranged, the Barbarian dealt more, the Rogue was more useful, what if breaking the vault opened melted the contents within as a safeguard. Those are tangents and you've been doing enough of those already. They both equally preformed the job of killing the opponent. Exact damage has no god damn bearing as long as they died.
What matters is did the Rogue miss or not. Same Scenario, Rogue's hit chance increases, by any means (this tweak or even not).
Barlor summons Balor, Rogue shoots them both dead, then the Rogue goes on to be even more useful. Even if there were Balors lef to fight the bonuses to the Barbarian were meaningless, the Barlor's AC was only 30 and he hit anyway under the old system and the new. Not a thing changed for him. But it did for the Rogue.
Also, at whom ever. HP is your
last line of defense, ghosting someone while hidden could mean no one even attacks back to begin with. Then miss chances, saves, moar miss chances, then maybe HP are considered. Also HD wise, the Barb only has +60HP or not enough to survive a round of attacks anyway. Con bonus matters and Rage curtainly gives that, but again HP vs concealment/intelligence is no contest.
Now I am REALLY pissed the fuck off with Assassin's Creed and spent the last hour tossing the remote to the floor and riddling this post with thousands of misspelled words. I'm going to go kill some fucktards at Ubisoft and take a nap until I feel better.