I completely agree!
There’s no easy answer to this b/c the ankle ball joints are smaller than the standard, so the feet won’t outright fit onto a new body without modifying one or the other. Then, the two ends of the stock wrist joints are not standard size either, so you either have to modify each individual hand to fit new wrist joints or modify the wrist socket on the new body to fit the stock wrist joints. And, you’d also have to modify the stock rubber torso “shirt” by carving away excess rubber around the lower waist and pelvis/crotch to get it to fit a TBLeague body. It’s way more involved than just body swapping which is infuriating.
I have an idea on how to modify the arms from a ganghood muscular body to work with this figure but haven’t had time to implement it yet. I’m also toying with the idea of grabbing the arms from the future HT Thor figure whenever it is release to try to use with this figure.