It's a fact. That is how electricity and audio works.well that's your opinion and let's not go there.
If you amplify 0010110 the result is 0010110
Because perfection doesn't exist and every electric circuit (any, no exception) inducts noise, you can never reach perfection (which is why you need LCs), but there is nothing thats closer to perfection than full digital amps.
Amplifying the digital signal is superior to converting it into an analog signal and amplifying that.
This is not an opinion, this is called science.
Not just are Full Digital Amps better than DAC+AMP, R2R DACs are, by far, the worst performing DAC on the market. Scientifically proven by several independent measurements.
Every other DAC from any other manufacturer (AKM, ESS, Cirrus), performs better
R2R is an trend for the audiophiles who owns everything and is bored and needs something new