I actually think it was unintentional in Budokai 1 at least. Sort of like how cancelling special moves in Street Fighter 2 was unintentional but became a vital part of the game and all its sequels and other 2D fighting games. It does seem like a strange coincidence how it just happens to make Goku criminally overpowered in Budokai 1 and 2 though. I'm pretty sure it was intentional by B3 even if the CPU didn't do it. The long combos were just too epic to be an accident. That's why I like Dimps. They trust the serious players to be smart enough to discover the combos without having to explain them in-game. I'm betting they thought that it would turn casuals off the game if they tried to force it on the player. I still remember playing Budokai 2 on Very Hard and having Frieza bust out some insane combos on me and wondering how on earth he did that
