[Matrixbeast]

It's because it's a no win situation.
Fans demand full teams. Only red and 6th sell. Others shelf warm for ages.
It puts Bandai in a hard spot, since they can either put out what will sell and piss off fans, or appease fans while knowing 4/6 of the team will sit around.
On the flip side, they could make half the team online exclusive, but that's a whole other can of worms.