First few things about B-Spec Mode - not about how wes used for grinding the cars and game, but how was concieved:
From official source:
"In the winter of 1997, the original Gran Turismo changed the history of racing games. This year, Gran Turismo 4 will cause another revolution to the world of racing games. Gran Turismo was the pioneer for introducing a new playing style by allowing players to spend just as much time watching and enjoy replays of their performance as racing.
Gran Turismo 4's new Director Mode (or B-Spec) is based on the premise of playing through the replay view angle only. A "Racing RPG" so to speak, B-Spec = Director Mode introduces the "Gran Turismo that players don't drive". In B-Spec = Director Mode, the game proceeds in the replay view point (Broadcast view) from the start of the race. GT4 includes the traditional experience where players participate and drive for themselves, referred to as A-spec. But this time, players will also have the option to be the director or race team manager of their race, and not have to worry about driving (as B-spec).
B-Spec = Director Mode brings a new experience to racing games, in which players driving themselves has previously been the standard. In B-spec, players give directions, taking on the role of a race team manager, giving directions to their A.I. driver and competing in their races. This mode can be applied to all of the races available in GT4, and does not standalone as a game mode by itself. Players can complete all of the races included in GT Mode by using B-Spec = Director Mode, without driving themselves at all. Players who had difficulty in racing can now take the option of carefully preparing their car for a race, sharing the excellence and exhilarating excitement of racing in a whole new style of racing games. That is what B-Spec = Director Mode is all about."
Of course, B-Spec couldn't be used for 2 types of races - License Tests and Mission Races, by logical presumption that both are somewhat required to be done in A-Spec and because of somewhat "elitist" nature of both modes.
IMHO B-Spec is a great addition to the world of Gran Turismo. I have never managed to get perfect 9999 - 100/100/100 score on my Bob, but I was close.
In order to make him being in more than 7500 - 90/90/90 class you had to drive many, many races and find ways to improve his score.
From the very first days of GT4 and B-Spec I saw it not only as potential tool for people who does not have so much time to drive, but as tool for time when online will come into play.
Just imagine some kind of "next-gen" B-Spec where he would be a true "AI", with 50 or more fields of evolving.
And than imagine that B-Spec AI players can be dueled over internet in real "manager" races for money and prizes in Endurance battles. Than imagine few B-Spec AI players that drive for the same "Team" managed via 2 or more human players in online.
Possibilities are endless.
Looking on B-Spec as only a tool for "lazy" players is so wrong. I understand that you may think it is not "true" driving but if you have had spent more times wiith B-Spec mode in GT4 than maybe you'd better understand it's sheer beauty.
Driving 20-laps races and enjoying on graphics, sounds and perfectly executed live-replay while being nervous all the time managing pace, pit-stops and everything because of the race outcome is one of the greatest experiences in racing genere so far.