The issues that plagued Acrobat 11 with regards to color rendition on screen have been resolved as far as we know with Acrobat DC.
On the other hand, Acrobat does take color management very seriously. If your content is tagged as GRACol but you are printing / proofing to a device with some other profile, yes, CMYK to C'M'Y'K' conversions will occur both during print (and even Output Preview). However when printing, you can preserve pure CMYK colorants via the Advanced Print Setup options accessible from the Acrobat print dialog. Go to the Color Management tab. Checking the Preserve Black option preserves pure black (i.e. CMYK=0,0,0,k) when doing a CMYK to C'M'Y'K' conversion during print. Checking the Preserve CMYK Primaries option preserves any of the pure colorants (i.e., CMYK=(c,0,0,0), CMYK=(0,m,0,0), CMYK=(0,0,y,0), and CMYK=(0,0,0,k) during a CMYK to C'M'Y'K' conversion during print.
- Dov