I guess...I don't understand what the issue is here...the monster's **should** be tougher than the heroes...that ensure that there is a challenge and chance of death. The fact that the party has access to extensive healing resources, group tactics, scaling power strengths, action points, epic destinies, etc.
They also have circumstance bonuses that monsters often don't have, like those granted by the warlord / cleric / bard in the party that aren't factored into the base "math" which is really simply comparison of defense versus attack.
So...I appreciate the effort I'm just not sure that this does't take the homogony of the system too far.
I believed the same as you do until I ran a mock 22nd level combat and the encounter took 19 rounds and the BBEG still was not defeated. So, I analyzed it further.
The synergies that you mention do not make up for two things:
1) The delta in the math. -4 for PC offenses, -4 to -7 for PC defenses.
2) The monsters are designed to handle the increased synergies of the PCs. Percentage-wise, they have a lot more hit points, they have more powers, they have more synergies themselves (such as boosting ally defenses or decreasing enemy offenses), they have more area effects, auras, etc.
-4, or -4 to -7 can partially be handled by paragon abilities, powers, feats, etc. The problem is that one is forced to take certain abilities (feats, powers, or paragon paths), just to stay competitive at all and even then, the PCs are mathematically behind the 8 ball.
Players are forced to take feats like Iron Will, or they get hit 80% of the time or more with Will powers at real high level.
WotC realizes this as well. Otherwise, they would not add mega-powerful feats like Epic Lightning Reflexes with not only is +4 (a HUGE boost), but it stacks with everything.
There is a serious problem here that WotC is trying to correct.
I just chose to correct it without using feats to do so. That does not really fix the problem, it bandaids it.