Each of the 4 regional conferences mimic what we roughly think of as college conference sized geographic footprints.
They guarantee representation for the entire country.
They qualify teams for the "champions league style" Super League that is a national competition
This now gives us best vs best from each region running concurrently with the regional conferences
Lots of regional rivalries... something to compete for... the ability for the largest cities in the US to host multiple big clubs without it blowing up the system for everyone else
Financially MLS teams have zero incentive to run good academies.
They can acquire young players without having to pay compensation to the developing club, they have a draft, American MLS players are severely contractually restricted, and there is no punishment for being bad.
Developing good young players in house is a positive in top leagues where salaries are high because the players are less expensive.
MLS teams pay American players low salaries and they do not have transfer fees attached to them...
Why spend big money developing players when comparable players with the same salary costs are available with zero transfer free on the player marketplace?
If you arent super confident that you can make money selling pre-Academy slots to parents to turn a profit on the system...