Who made the animation from dragon ball z episodes like goku vs kid buu (ep 279) or goku vs majin vegeta and why did they stop to do this type of drawing?

Dragon Ball Z Minute of Desperation (TV Episode 2003) - IMDb

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Majin Buu Saga, Dragon Ball Wiki

Goku vs Cell is the best fight in Dragon Ball Z/GT/Super

If Goku had gone SSJ3 against Majin Vegeta, would he have won? Just imagine Goku tried holding in all of his energy as much as, and as long as he could.

re: Is there anyone here who says SSjin 3 Goku is the strongest in the Boo Saga? - Page 5 - Dragon Ball Forum - Neoseeker Forums

Kid Buu Is The Strongest Majin Buu! (Anime & Manga)

Was Goku vs Vegeta 1 the last good fight in Dragonball?, Page 2

DBREWATCH – Dbanimators.com

According to some, Goku has been Universal since the Buu Saga, however, I don't remember anything that was even Galaxy Level, so why is this a belief? Is it just wanked power