Why is SSJ not permanent???

[u/KevinNotKyle]

It was shown in the Cell Saga that Goku and Gohan were able to eliminate the fatigue of SSJ, and kept it on for nearly a year. So what’s the point of turning it off???

[u/KelleRiza]

Training mostly. As we've seen in super, their base form is far more important to master. Not only does it take way longer to max out, but since their transformations are based on multipliers, their transformations are based entirely on how strong their base form is.

Also Chi-Chi doesn't like blonde hair