Why Won't Dragon Ball Super Use Majin Buu?

gamerant.com:

Dragon Ball Z's final arc, the Majin Buu Saga, saw Goku and the Z Fighters battling the titular monster, who evolved into several forms before eventually splitting into two halves, one good, and one evil. The evil half, Kid Buu, was eventually defeated by Goku's Spirit Bomb and reincarnated into Uub. The childlike Good Buu would go on to settle down and live on earth with his best friend Mr. Satan, making him an ally of the Z Fighters.

Even though he's weaker than Kid Buu, Good Buu is still arguably the most powerful being on Earth aside from Goku and Vegeta (and Arale), and still rivals the two of them in strength. Yet for all this power, he is remarkably underused throughout Dragon Ball Super and GT. Recent developments in Super's manga do make Buu a more complex character, but he's still solidly behind other less powerful fighters like Gohan, Piccolo, and Krillin in terms of his time in the limelight. Why is that?

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Although he's so strong that he was one of two beings in Universe 7 even Frieza feared (the other being the God of Destruction Beerus), Buu's biggest asset is his virtual immortality. His gooey body can regenerate almost all damage he receives instantly. Buu is not the first Dragon Ball villain capable of regeneration, with Piccolo and Frieza displaying it on a limited level and Cell also employing it, albeit more slowly. But the extent at which Buu absorbs damage is unrivaled among any character in the Dragon Ball multiverse.

This makes Buu even harder to defeat than Goku or Vegeta, and it's still hard to imagine him outright losing, even to Super's strongest villains. Beerus admittedly made short work of him in Super's first arc, but Buu was also largely undamaged by the