I realize that there are manufacturers who share this view but certainly not all do.
Maybe it’s because the ones that don’t Charles, can’t make "discrete R2R dac’s" as the complexity is many many times higher, and they also can’t get R2R dac chips ready made any more.
So they don’t have an option but to go to DS or DS hybrid, as these chips are available (and cheap) .
BTW: You don’t see anyone going to the trouble of doing a discrete DS or DS/hybrid do you? Why is that?
Cheers George