I’ve actually been writing a story with a more realistic idea on this
Dude has the stamina to do all that walking? His mother made him do a sport and track is the only thing he could tolerate. Still ends up exhausted when he has to carry the stuff a normal adventurer has to deal with
When he first arrives, he is flipping between trying to find the cool side of it and freaking out because, “Oh fuck uh I actually was ripped from my home”
Lots of action happens within the first few days? Has a mental breakdown when his brain finally catches up and he can no longer distance himself by comparing it to isekai tropes
“My modern knowledge makes things easier”? “…We uh, have magic that does that, why the hell would being able to harness electricity to make light matter? Besides, another country figured that out ages ago thanks to magic, just many of us prefer to use magic for it because cultural momentum”
JoJo is basically the idea of rule of cool. It’s over the top and bombastic