The canon version of Super Saiyan 4 can't compete with God forms, but Dragon Ball GT's SSJ4 is borderline overpowered.
Dragon Ball's iconic Super Saiyan transformation isn't as straightforward as it seems, as every character has a different motivation for transforming.
Only a few transformations in Dragon Ball Super are stronger than Legendary Super Saiyan, and even then, just barely.
By the end of the Cell Saga, Super Saiyan has been outdone by multiple transformations, which Dragon Ball Super has only doubled down on.
Dragon Ball Daima did something fans never expected with a controversial transformation in the franchise and made it better.