I know this but why not giving a specific encoding profile which would match to the master file? Not only the bitrate but many others details (like in broadcast world with TV channels).
I mean, then : one "untouched" file for highest quality, and then recompressed versions made by Youtube themselves for lowest / resolution quality options.
I don't know, maybe I'm dreaming in something impossible

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By they way, how does Youtube choose if your file will be encoded in VP9 or AV1?