and it's a valid point.
Not for nothing. If you need to obsess, it's not a bad thing to obsess about.
There is something to be said for not doing conversions unnecessarily. Although I'm sure Dune does the conversion correctly, that doesn't mean it's necessary. And why burn HDMI bandwidth for nothing?
I believe the reason Dune does it this way is that the Sigma SDK is coded to accommodate the maximum color-sampling without having to renegotiate HDMI when the sampling is less than 4:4:4.
Sorry. Hope your head feels better.
EDIT: Looking back, I guess I just contradicted myself. The subject I used was "Nothing wrong with . . .", but "Nothing damaging with . . ." would have been more accurate, as an unnecessary conversion could be considered "wrong".