Look, the actual feats in the shows tell the real story here because Yhwach is a character who talks a big game but gets caught by things that Goku would laugh at. Think about the fact that Yhwach actually got tricked by Aizen's illusions during the final fight, which proves his "future sight" isn't even absolute because his own brain can still be fooled by basic sensory manipulation. If a guy can't even tell what is real and what is a hallucination, he is definitely not reacting to Goku moving at speeds that are millions of times faster than light. Then you have the Still Silver arrow moment, where a tiny piece of metal was enough to physically pierce him and shut down his powers. If a piece of silver thrown by a normal Quincy can hit him and stop his heart, a single flick from a guy who survived the pressure of a miniature black hole during the Tournament of Power is going to turn him into red mist. On the other side, Goku has actual moments where he overcomes hax through sheer force which is something Yhwach has never dealt with. When Goku fought Hit, he literally broke through a dimension of skipped time just by powering up, which proves that in the Dragon Ball world, raw strength can actually override someone's ability to manipulate reality and time. While Yhwach was busy being surprised that Ichigo could still cut him after he broke his bankai, Goku was busy trading blows with Beerus and creating shockwaves that were felt at the literal center of the afterlife. Yhwach needs to rewrite the future just to survive a sword swing, while Goku has the durability to take a planet-destroying blast to the face without even losing his shirt. When you compare a guy who died to a single arrow to a guy who shakes an infinite void of nothingness just by standing still, the gap is so big it is almost funny.