Banjo Kazooie's entrance in Super Smash Bros. is more than justified. Not only did the duo grace the Nintendo 64 with one of its most iconic games, but in recent years, Microsoft has been playing nice with Nintendo to the point where the crossover inclusion basically needed to happen now or (potentially) never.
It was weird hearing Sakurai tell everyone to "play the original Banjo Kazooie on Xbox" this week right? Although he's not technically a Nintendo employee he did say it on an official Nintendo stream, and that sort of collaboration (alongside of the release of Ori & The Blind Forest on Switch) hasn't happened in a long while.
So yeah, although Banjo Kazooie might not be a bombshell DLC for some, it means a hell of a lot to me, and I'm glad they made it to the party.