Yeah I support not tier jumping at all without some overt statement of "oh this guy is 1.45x stronger than the other" within the verse. One shotting is cirumstantial, certain body parts don't ever really get more durable, yada yada,
a guy got one shot by a punch irl so here's your real life comparison, boom a speedrun of all my calc takes as of late
Really though, instantly killing or knocking out someone isn't anywhere near consistent even in the real world where physics works. Fiction makes shit even less consistent than reality. This isn't some sort of metric we should be using to say characters are any actual value except "stronger than the guy who got one shot", and even then you don't even necessarily need superiority.