Even with his weights he possessed speed far above his pre-23rd incarnation, so a vastly weaker Goku who's barely faster than even Piccolo Daimao being able to handle 10x gravity seems like a stretch.
All of those Saiyans spent their entire lives on Planet Vegeta, and they were most likely...
I think the fact that 10 months after he unlocked Grade 2 Vegeta's regular SSJ was already on Semi Perfect tier shows to me that they were only tapped out on earthly training method gains. Stuff like Rosat and Z sword training just seem to give gains on a new level.
An adult Goku could hardly move in 10x gravity, and he displayed greater speed even while weighted even as a young adult, much less as a father. If Goku just lied in a crib the whole time as he did as an infant I would agree with you, plus even MSSJ Goku admitted due to the other harsh...
For some reason moon busting gets downplayed in general. Nappa destroyed like a millionth of the mass of the moon when he fired that warning shot at Piccolo that made him shit his pants over how deep the hole went, when a Piccolo who was a fraction of the strength he had at the time blew up the...
I feel like Yamcha knocked out Chi-Chi less casually than Goku did the Bear Bandit. I'd give her the edge over him, but Kuririn (first appearance) would stomp her I think.