Yes, I think it is necessary.  I don't create clothing, but those who do may use Daz Studio, and those who use Poser don't necessarily have Poser Pro 2014.  The feature you're referring to, I believe, is not in Poser 9 or Poser 10 or Poser Pro 2012, all of which will support the use of Dawn.

You can't expect everyone who wants to create clothing to buy and use Poser Pro 2014 ;)

Cheers,
Alisa

RETIRED HiveWire 3D QAV Director