On the evolution of BRP games, you are right.
On the evolution of BRP-related, I don't know (I don't have any).
On the choice of players, I can only speak of my own group and we all prefer separate skills. For other players, I don't know and thus can't speak for them.
On the original question, I don't have my BGB on hand (I have only the book, and not the pdf), but I seem to remember it uses separate skills, thus my answer.