jojo was a weird case because it was the most random ass characters in it being overhyped 10 years ago even though GER, D4C etc were (most of the time) rated fairly. Nowadays we just obviously know weird claims like "Sale and Kraftwerk have better Vector control than Accelerator" and "Ultimate Kars adapts to anything and solos the HST" is uh, not true.
I don't have the exact quote but when rereading it with official scans for the first time I vaguely remember an afterword where Araki said something along the lines of he toned down his powers in recent years to focus more on the world and people, which explains why Parts 5 and 6 skyrocketed the scale and 7&8 dialed it back a bit (sort of, in 7's case. I don't even know if he really said this to begin with I just vaguely remember seeing it)