fawful was brought back in partners in time because he was popular, then he was given a much larger role in bowser's inside story because of his popularity. there's a reason why the remakes are skipping over partners in time even though it really needs a remake, its because they were the most popular ones, partly because fawful was in them. hell, the remake of superstar saga gives him more screentime in order to make his appearance in bowser's inside story make more sense, and there will probably end up being more for him in the remake of bowser's inside story as well
fawful is a character that most critics say is consistently funny, fans brought him back from the dead, he's one of the reasons why people wish the rpgs and mainline mario games crossed over, he's popular, you don't have to like him being popular, but he is