I'm totally agree , this is the actuall weak point of 3D Coat , this is why it doesn't look like as professionnal as it deserves.
I would add , the support to a true multi UV like Mari does, not only the support of UV sets.
Where i'm disagree is about the support of Hair i would prefere to have it in 3D Coat, here at our studio we can use ZBrush to make some grooming,
then proceduraly scatter it on a surface and it works.
I'm allready fine with the modeling tools in 3D Coat,i don't need more.
I worked with zbrush so many times in production (i own a license as well) and personnaly i find 3D Coat more logical.