To me it looks like there would be a lot less problems with the shoulders if the chatacters were modeled and rigged in this position. Also, I would think that it would be easier to create pants with the legs spread like this.

Quite fankly, I didn't even remember the walk desinger when this difference between Poser and everyone elase caught my attention. It's probably because in the almost 2 decades I've been using Poser I've never used it...but then again, I've never been "into" animation. 

I'd rather stay in my lane than lay in my stain!