I think what was being said in that other post was that there won’t be any conflict with the way that ACF is saving values with WP.
I’m not the developer, and I can’t speak for him, but I’m sure this is on his radar and that it probably in the works. This is going to be a very large change and there will like you said, there will be backward compatibility issues.
I will mark this thread for the developer’s attention and if he has time maybe he’ll let us know if there is any time for getting it completed.
