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You can easily fix shoulders by either using ColorCurvatour's MorphLoader script and a modeller of your choice, or Poser's built in MorphBrush.

On the fly morph fixes are fine for still images, but do little for animations. 

Even with weight mapping, conforming clothes rarely look natural. The only way to really get a natural look in loose fitted clothing, at least for animations, is to use dynamic clothing, or a combo of dynamic and conforming, depending on what type of garment it is and what its doing. 

However, conforming clothes artists could put a bit more effort creating morphs for still poses, especially those who include pose sets in their products. 

I'd imagine the average poser user finds dynamic clothing too much of a hassle, which is a big reason why so much is conforming and has that balloon, plastic look to it.

 

I see a lot of people complain that there aren't enough hair models available for M4, yet just about every style of hair you can think of is available for him. It takes some looking, and browsing other sites, but it's there. It's hard to make hair look masculine on a model that's too "pretty".