You are correct, of course, that some of the newer CD players have digital ins...which leads to the opposite problem with respect to reviews - namely that the CD player reviews that I have seen focus on the "disk in the drawer" formats applicable to that specific player, and have only a few offhand comments regarding the digital in. I haven't seen much comparison at all of the "high resolution" sound achieved by using the digital ins on a given CD player vs. a given DAC.
In reviews, I hope we are moving toward the consideration of the relative sound quality of all of the formats that a player/DAC can handle, much like reviews used to (and sometimes still do) focus on both a player's redbook and SACD performance.
With respect to my current purchasing decision, I'm kind of looking for someone to say "I had a [high end CD player] in my home system, and I got a [high end DAC], and I listened to them side by side in my home system for a week and concluded that the DAC clearly bested my CD player on redbook performance."
Having not seen this in any review so far, I am reluctantly reaching the conclusion that while a DAC would be nice to have for the higher resolution stuff, DAC rebook performance is inferior to comparably priced standalone CD players. That is consistent with the conclusion that I reached in my own side by side test, but for cost and convenience sake I sure wish it was otherwise.