Probably just me, but I am less concerned with how good my error messages are, and more concerned with trying very very hard to make the errors happen closer to the cause of the problem, rather than further away. "Fail early, fail hard" i.e. if I can make the error message happen near the beginning of a process, I can get away with making it a hard error. Hard errors in the middle of a multi-hour operation tend to an…
Users don't care if you consider an error soft or hard.