Not only is possible for a bottom of the heap computer to function as part of a front end for high end system but given the right DAC, this bottom of the heap front end can and will outperform traditional digital front ends (read: ultra expensive CD transports) will relative ease.
Let's accept this as true.
Why is this the case? Both start with the physical CD which contains an analog of the digital data stream. Both a computer and a CDP use a disk drive to recreate the datastream. EAC and other good ripping programs work faster than real time.
So why would a computer do a better job at this with cheaper components than anything other than a top-line a CDP?