If the async USB dac is built into the 103, then then you would not have to buy a separate coverter. I think a lot of people are just getting into computer music and the availability of a usb converter would be a help for them. Rather than buy an $200 converter and an ordinary $200 Blu-Ray, you could just buy a superior Blu-Ray/CD/SACD player with a built in converter from a company you trust. And, some people are content with the DAC in the 93/103. For them, $500 is a lot of money and will give them better Blu-Ray and a better DAC than they could ever get for $500 as separates.
It's a mute point since they are not doing it.