WHY was Goku so excited to meet and fight Uub, a kid Buu level opponent, when he already knew about Beerus, Whis, Champa, Vados, Hit, and all the other powerful fighters from the multiverse?
Let's face it, DragonBall GT makes more sense and fits into the official timeline much better than DragonBall Super. DBGT will always be more canon than DB Super.
DragonBall GT is the official sequel to DBZ, it is canon to the anime no matter how much Toriyama and Toei try to deny it now.