Super anime destroyed power scaling.
In the U7 vs U6 tournament Piccolo wasn't that drastically far off from SSJ Goku power wise, who had exchanged blows with Beerus in a weaker state, pre Whis training.
You literally have Mystic Gohan exchanging blows with Super Saiyan Blue Goku, but previously you have SSJ3 Gotenks doing 0 damage on Copy (Base) Vegeta.
Even if we go by the manga, you have freaking Mystic Gohan exchanging blows with freaking Kefla... who is easily a Super Saiyan God level character and well above. Sure Gohan got a lot stronger, but it all happened so fast and no new form before Beast.
Kid GT Base Goku is stronger than a SSJ3 level character by Rildo scaling, and SSJ4 Goku is immensely stronger than that, SSJ4 Gogeta is in turn immensely stronger than that. End of GT Goku might be billions or even more times stronger than his 100 years earlier self.