There are several proposals to improve the quality of exported GeoTIFFs:
1. GeoTIFF can only be exported in RGB. CMYK should be an additional option which would be important for printing maps.
2. GeoTIFFs shouldn't have pixel inside the map with the color value 0,0,0, because this value will mostly be used as NoData-Value in other software products to remove black wedges (attachment 1). If you set the NoData - Value 0,0,0 black contours of the road will be also removed (attachment 2).
3. There are no functions for smoothing black contours which are part of the road in ArcGIS.