Mark CMG
Creative Mountain Games
I think there's a way to allow the simple fighter to contribute while allowing greater tactical utility for the complex fighter. Let's say that the simple fighter just did a straight attack for normal damage, but the complex fighter could choose to do 1/2 damage and trip in the same attack. Both could be contributing the same amount to the party, but one's just attacking every round and the other one say Sunders the opponent's armor to set up their Power Attack to be even more effective than normal, or Trips the opponent so the Rogue can get their Sneak Attack off, or Bull Rushes or Grapples the monster that got too close to the squishies.
I see where you're going but I think the question is whether the (mechanically) simple fighter can be run by someone who simply wants to perform tactically in a narrative manner (even beyond just swinging to hit and rolling damage) and have the DM deal with it through Ability Checks and Opposed Rolls (beyond to hit rolls and damage rolls) while the complex fighter has all of the maneuvers spelled out as powers and feats and whatnot? And for these two same-level fighters be equal in effectiveness?