GT4 B-Spec is what gave us the 'Race Director' fix. As well, it had a few more bells and whistles (or at least some that worked better than GT5.)
It also helped that one had Bob to grind out the money bringing in the Minolta that could be resold.
No B-Spec right now means that those who would have used the AI to grind cannot do that right away. No B-Spec grinding = more micro-transactions.
But B-Spec will eventually appear, hopefully for those who like to play Crew Chief, sooner than later.