Good argument. All soccer players (who really "can" and "want" to play) join club systems, thus we have no other options.Agree with this.
And the original question: if “club soccer is really necessary or even the best route for developmental purposes at the younger ages?”
Club is necessary for one reason: that’s where the players are. Not in rec. Not playing (free) pick up ball at the local rec center or loosely organized on the streets and beaches. The players, resources, and time is all locked up in the Pay to Play Club System. And the club is the gatekeeper—no pay, no play. The clubs have hijacked the youth sport in USA.
You can argue what value the clubs bring to developing our youth players, but my opinion is that clubs are a parasite. It’s the players individually, their interaction with each other, and mom and dad’s money buying private training and access that develop the player. It’s unfortunate. There are better systems out there, but this is our hell.
I do not see a subsidized, competitive, organized youth sport can exist in this country. If football/basketball/baseball cannot do it, then it is almost impossible for soccer to lead the way.