Nameless, the beauty of certain amp/dacs is that you don't HAVE to use one or the other. I mean, if you're one to constantly sell, sure, you're stuck, but with something like the Compass 2, you can use an external dac, or an external amp if you want. Chances are, if you're buying an amp/dac, you're probably not worried about upgrading after that point. I would've been more than happy to keep my Compass 2 as the only dac/amp I'd ever need at home, but I needed the money.
In fact going on towards the future, all I'd want is amp/dac all in ones. AT least with something like the Compass 2, I could still buy a tube amp or something if I wanted a change, but don't wanna give up the SS amp in it.