>>540396
>When Blu-ray came out, did producers reshoot the movie?
If it's a live recording then of course it's not worth the hassle. But when it comes to music made on a computer with instrument samples it's a lot easier to just redo it with proper channel positioning and mixing for new formats with better samples than trying to use .wav files made a decade ago. I'd imagine it's the same thing with CGI films, you can re-render the entire movie in 4k rather than upscaling and remastering the original footage. Adding in 3d probably wouldn't be that difficult as well.
All the people I see make and keep those wav files never touch them. I ask them why they bother and they give me the same reason you just did, that they're the equivalent of master tapes. It's a waste of time in their workflow and clogs up their backups when a several hour long symphony has over two dozen instruments. I've seen 400+megabyte files for a triangle or gong that was used maybe 2-3 times in an entire piece. But they'll keep doing it as it's considered the standard way of making music.
>>540407
Go put some vorbis and mp3 files on a thumbdrive, 99% of consumer electronics out there are only going to play one format.