Here's an argument about why this is clearly broken that I think most people could get. This game is about freedom to play as you like. So if you wanted, you could just roll up a party of four identical Fighters.

Now, I'm not even talking about Tactician difficulty, these four fighters are playing on Classic difficulty, and they are built pretty much identically, same attribute distribution, same ability distribution, same Talent distribution. (Maybe different civil abilities and slightly different skills, it doesn't matter.) With one exception: One of these fighters put an extra point into WIT, the others did not, putting it into something else.

Let's say that these fighters are pumping STR and WIT pretty hard, the majority of their points are going into STR and WIT. Because of this round-robin system, three of those fighters are getting exactly dick-all* value out of nearly the exact same point investment. The guy with +1 WIT is going to go first, then enemy/ally the rest of the way regardless of how much more WIT the rest of the party has compared to the enemy.

All those other points the three other fighters spent on WIT effectively give them no benefit compared to someone who never invested a point into WIT. And that's not right.

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*(You'll notice that I didn't mention Critical Chance. That's because a mere +1% Critical Chance is not good enough for a primary attribute. That could easily be moved to be some combination of every two points into STR/INT/FIN (possibly not counting bonuses from items).)