What saddens me the most is to see those kids who grew up with a smartphone in their hand trying to convert a picture by renaming it. It is a problematic form of computer illiteracy.
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Why shouldn't that work? I think it would be pretty great if changing the file extension popped up a helper that asked me if I wanted to convert from HEIC to JPG?
Really, no-one should have to think about file formats when they're trying to do something that has nothing intrinsically to do with file formats.
Seems more like a failure of software engineering, to me.
The failure of engineering was clearly with the test authors - they should have been validating their inputs.