It all depends on your preferences, I do use the grouping tool quite a bit in Poser.  I use it a lot for working on props with parts of props.  In  terms of conforming clothing, I am suprised you couldn't add groups in the group edit tool.

Hardware:  Cyberpower PC,  2 - i7-3970X CPU @3.50 GHz (12 Total Cores), 32 GB RAM, 2 - GeForce GTX 690 $GB Video Cards, 2 - Viewsonic V3D231 23" Monitors

Software: Poser Game Dev, Vue xStream 2014, 3ds Max 2014, Maya 2014, Mudbox 2014, Corel PaintShopPro, Unreal Engine 4, Iron Python