Dragon Ball: Why did Goku & Vegeta not fuse in the Tournament of Power?

With the imminent return of Dragon Ball Super, many fans have taken this hiatus as an opportunity to reread the series from cover-to-cover.

Dragon Ball: Why did Goku & Vegeta not fuse in the Tournament of Power?

Every Important Dragon Ball Transformation, Power-Up, and Fusion So Far - IGN

Every Important Dragon Ball Transformation, Power-Up, and Fusion So Far - IGN

Dragon Ball Super: Broly. Broly. Is. Canon!, by Ryan Wright

God Fusion Goku, Dragon Ball Wiki

If Goku and Vegeta never gained their god transformations and had to fuse and became SSJ 3 Vegito, could they have defeated Golden Frieza? - Quora

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Dragon Ball Super 2: The Fusion Of Goku and Vegeta - New God of Destruction !!