Unfortunately, that's not how the game works with the large services firms. The salespeople and account/project managers run the show. Their business isn't selling expertise / solutions, it's selling the maximum amount of billable hours at the highest possible margin via the illusion of expertise / solutions. (I say illusion because if you read the fine print of one of their typical contracts, there's very little actually promised other than providing warm body of type X for hourly rate of Y)