You said "It's small and easy to grasp the entire thing though, unlike most other more modern high level languages."
The entire thing doesn't include corners? And you entered the conversation in support of someone that literally said "every corner, nook and cranny"! If you were making a much weaker claim, it's on you to make that clear. Instead of this petty "doesn't address what I wrote" garbage.
On top of that, being able to suss out what is undefined behavior is in fact quite important for proper use of C. I wish it was a super rare corner case but it's not.