I2S can work. However, every manufacturer does it differently because it isn't standardized. There are $$25K DACs out there that don't support I2S.
We have a lot of fools choosing equipment by whether is has I2S or not, rather than the reissues that affect sound and performance. I think that's a pretty good example of a fool's errand.
Keep reading and you'll eventually see that I don't say foolish things. Been to a lot of rodeos.
Jerry