"Has the computer based system fully arrived?"
I feel that it has. Others may have lesser experiences with their gear and software. There a currently two high-performance roads: Networked using proprietary devices such as SB Touch or Sonos, or async USB converters and DACs. Networked is simpler, but does not support hi-res and is limited in performance due to the proprietary nature of the hardware. USB is more open, so one can select playback software, computers etc. to achieve optimum results. The recipes for good USB results are getting to be well-known, so most manyfacturers can provide guidelines.
Manufacturers will always disagree because they are in competition with each other. It's up to you to sort through the marketing BS to get to the truth.
Did you know that 90% of the exhibits at RMAF use computers for their source? Did you know that several took best of show in 2010 and 2011?
Networked audio will at some time in the future become open and ubiquitous, allowing all manufacturers to compete on high-performance hardware. This is at least 3 years off IMO.
In the meantime, there are USB converters and DAC's available now that not only beat the very best CD players, they actually beat vinyl. This is primarily based on posts and feedbacks, but my own experience is the same. If you want to see these posts, I can put the links here.