Well, Super Saiyan Blue's peak power can only be maintained for a short period before gradually decreasing from stamina drain and because of it, the user to be unable to pull out even 10% of the form's full power...to maintain it's form, they have to Nerfed it so they can repeat the transformations...
But, in manga version, Goku and Vegeta managed to complete it... They gain Super Saiyan Blue Complete which drew Blue's full power, like Goku can fighting Fused Zamasu head on and nearly killed him but failed due Zamasu's immorality...
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