Actually I'd argue it's wrong precisely because we do manage to retrieve even such old artifacts. Only problem is that nobody cared for 30 years so the process was harder than it should be but in the end it was possible.

Sure, there is a risk that at some point, for example, any version of every PNG or H.264 decoder gets lost and so re-creating decoder for that would be significantly more complicated, but chances for that are pretty slim, but looking at `ffmpeg -codecs` I'm not really worried for that to ever happen.