That’s all true, but the potential for confusion is considerable. At present, people can swap audio and subtitles from release to release without worrying about sync issues – for a fan community dispersed around the globe, that’s a major achievement in terms of standardization.
The switch from PAL GOUT to NTSC GOUT was nasty in part because it was such a minor sync change (two frames at its worst).
If there’s a ten-frame sync change, everyone will know there’s a mismatch right away. But two frames? Some will notice, some won’t. It will sit irritatingly right on the edge of perception. In the case of ROTJ:DE 1.0, for example, the video was PAL GOUT, the audio was NTSC GOUT, and maybe 80% of people didn’t even notice a problem, at least at first – including Harmy himself!
That’s a problem, when two standards are so close that you can easily use the wrong one and not notice until it’s too late.