I don't buy that it's better for developers at all, because a significant % of the time you get such errors is because of an issue in the code that we then have

I don't buy that it's better for developers at all, because a significant % of the time you get such errors is because of an issue in the code that we then have to track down and fix. And it's never the developers arguing for such messages. Lazy devs might think nothing of popping up a message showing just the exception name/message or error code which I'd argue is better than just "oops...".