Because it contradicts everything we see in the Cell Games.
Super Saiyan Gohan > Perfect Cell Raised Speed > Perfect Cell Initial > Super Saiyan Goku > Cell Juniors > Super Saiyan Vegeta ~ Super Saiyan Trunks > Piccolo > 50% Super Saiyan Goku ~ Exhausted Super Saiyan Goku >>>>> Base Saiyans...
That doesn't change the fact that the Saiyans were confident enough to go into the Budokai while in Base the whole time, knowing Piccolo would compete.
Base Saiyans > Kaioshin > Piccolo is the most logical. It seems like a massive retcon to the Cell Games and we all don't like it, but going by this chain in the Boo Saga makes it much less complicated.
Android 21 too.
Not Majin Android 21 though. I wouldn't want her to turn me into a sweet and eat me, or worse... Go inside me and inflate me like a balloon.
I think I realized why I put Fat Boo above Pre ROSAT SSJ Gotenks twice. I was focusing on Base Gotenks Post surpassing Piccolo's expectations of SSJ Gotenks Post compared to SSJ Gotenks Pre, instead of focusing on SSJ Gotenks Pre > Fat Boo. LOL.