Your assumption is nonsense, obviously, but setting that aside...
There's nothing wrong with team coordination. The problems arise from the current emphasis on burst and LB coordination and the fact that players in their first match are pitted against players in their 10,000th, the latter typically stalking the field in a highly-effective premade. Add to that your lead DRK dropping a waymarker, and the whole exercise -- even when done "well" in the context of this playstyle -- involves everyone running after the waymarker in a deathball.
That is highly coordinated, and very boring.
Any team PvP mode requires coordination. Unfortunately, the current job skillsets reduce that coordination to a self-appointed commander barking instructions. Rather than headless chickens, this produces chickens tethered together, except on Shatter where they are lemmings.
And before anyone leaps in with "but there are far more interesting strategies on JP..." Sure, no doubt. On NA where half the team is only there for XP, such strategies will never emerge.
tl;dr I agree with your definition of over-coordination within a team being something that hurts the team's chances of winning, although I can't think of an example of how that would happen. My gripe is with the nature of the coordination that arises in the current meta.