The only reason 4k83 wasn’t GOUT synced is TN1 wanted to use the original audio track on the release print because of how well preserved it was. There was no need to sync to GOUT for audio tracks. I don’t know why that prompted a conversation of whether or not we should jump ship to a new standard. And if someone wanted the 4k83 track synced to GOUT, they could do it. Not only that, but it would also break timing of a lot of our subtitles. IMHO it isn’t worth it, literally no one is going to notice a handful of frames.
I don’t think that’s the main reason. From what I have read in the other forum, the underlying reason that 4K83 wasn’t GOUT-synced was that TN1 wanted to preserve the entire film: not just the audio, but the actual frames too - even though there were only a couple of extra ones. IMHO, they have made the right call in the long term, provided that the leaders of other major projects are in agreement going forwards. But I take your point that in the short/medium term, it may be a lot of work for those involved in subtitles/audio tracks to convert everything to a new standard.