I dunno, the playing style such as it is of MLS definitely emerges from the strengths and weaknesses of the circa-Aughts American-developed player. “Orange slices guys” I sometimes derisively call them.
Anyway, CONCACAF also-rans being stronger, and in turn providing stronger players to MLS is a positive feedback loop. It’s just that the US missing the World Cup is a damaging and unacceptable side effect.
Yeah, you're right that it has become the US-style of play because we didn't have the pure quality of play, so it all became about speed and physicality. It was also what was required to play in and succeed within CONCACAF.
While I do think that keeping better US players within the MLS is better for the league in general and contributes to the positive feedback loop you discussed, the reality is that the quality of the league was likely damaging the overall quality of the national team.