MHA is the only answer for quick power collecting. But I know Akikan wouldn't do that since he tend to go for less mainstream anime... Like those anime that make you think of "Wait,that's a good idea. Why didn't I think of it" kind of anime world..
They may know but since it's a shallow knowledge,what they only know is the "I need to cut your wife open to pull out the kid" and not the next step. Like they just stitch it up and hope for the best.
Because he could do it himself. The only reason he didn't is because he doesn't want to do it himself. Dude got Minecraft power,that dude can conquer world with pickaxe.
Ch 16 Chapter 16
I Only Want to Enjoy Life But My Little Sister Want Me to be King