I agree with all points, each of these characters has been fleshed out enough that it’s simple enough to know that Kazuma would take one bad death and instantly NEET himself into a hole as fast as possible… and if anything would somehow get himself in a death softlock where he likely couldn’t progress… but if the story was written in a way where Kazuma was the main protagonist and the various needs to get him moving were placed before him, I believe it’d be many times more enjoyable to watch than the understandably determined Subaru.

If Kazuma wasn’t able to hole up and was plot railroaded on like it sometimes seems Subaru is, I think he’d figure out the best (quick/painless) ways to reset himself and generally move things along at a better clip.

More importantly than that though, his understanding of the death system would lead to WAAAAAAY worse checkpoints. He’s not the kind of guy to act with any care given to consequences when he knows that death is a quick reset away from whatever he does. The actual timeline for Kazuma would be cursed to the point that his actions assuming no consequences would probably be the thing to get him softlocked in a horrible ending of constant death.