I understand what your saying.
What I'm trying to demonstrate is none of this is intuitive. It shouldn't be hard to understand how to Train a Basketball Team. But that's never the goal here, the goal here is to develop like 1 to 3 guys at a time, and no one else is thought about.
Which means everyone pretty much does the same thing. Trains the 1-3 guys they want, the way they want, and buys everyone else from people that trained them. And largely, there are only a limited amount of builds viable. Because when you can only train 1-3 people, you need to train them just right... you can't really afford to mess around and experiment.
It's hard to do other Systems, because not enough people are pumping out players for those other Systems. You might want to FCP, and you might build your 1-3 guys for that... good luck signing the other 9 you need. No one is building those guys.
So why go against the grain? Just run what everyone else runs, so you can Buy the Players to fit the System. Which means you're stuck Training the way everyone else Trains, so those guys fit the System.
And if you don't realize that really early on, and why would you since that makes no sense, you've just screwed your first Team.