The developers are adding a few new perks, making all the must have accessible to only a select few players. This creates a competitive disadvantage for those without the new perks. However, if there were 25+ new and interesting (not OP) perks per crew, there would be more diversity amongst the tanks and players could truly customize each crew member. It would be impossible to have all 25 perks. Yes, a small group of players could have 10 of the new perks, yet they would have to decide among 25 options.

Hope this made sense!