Why use CD Transport instead of computer source

I have been seeking a new digital front end setup and would like some advice on what solution will produce the highest quality digital playback.

My current plan is to add a Slim Devices Transporter possibly mated to an external DAC, after evaluating the Transporter on its own to determine the quality of the internal DAC (which I understand is quite high).

Why would I consider a CD Transport and DAC as an alternative to a computer based source such as this? If I am using EAC to get bit-perfect rips of my CDs and I encode them in a lossless format like FLAC, there doesnt seem like there could be any benefit to using a CD Transport, in fact, the computer based source should be better if the rips are done bit-perfect.

Any comments on why there is still a high end market for CD transports given the availability of top computer based sources like the Slim Transporter?