Not that I wan to engage George. I really don’t because he is SO one sided.
BUT. I just replaced my Davinci2 with a Pilium Elektra DAC that uses Delta Sigma chips, eight of them to be specific. And to my ears it bettered the mighty Davinci2, which is one of the best dacs ever built.
My point being that R2R dac chips are awesome. And can make amazing dacs. But it is not the ONLY way to get to statement level digital conversion. Whereas George opines that R2R is the ONLY way to get to the top.