> So inside a destructor throw has a radically different behaviour that makes it useless for communicating non-fatal errors

It's weird how you tried to frame a core design feature of the most successful programming language in the history of mankind as "useless".

Perhaps the explanation lies in how you tried to claim that exceptions had any place in "communicating non-fatal errors", not to mention that your scenario, handling non-fatal errors when destroying a resource, is fundamentally meaningless.

Perhaps you should take a step back and think whether it makes sense to extrapolate your mental models to languages you're not familiar with.