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I've seen a lot of fairly significant fitting problems on conforming clothes made using Poser-style rigging as well-- things that were just plain badly modeled and/or badly rigged, with collars that "float" an inch or more out from the neck, straps that "float" an inch or two above the shoulders, belts and straps that "float" a couple of inches out from whatever body part they should fit snugly, and so on-- not to mention poke-through ranging from small bits the size of a quarter to huge things the size of a dinner-plate.  And a goodly number of those were on "simple crap" like halter tops and arm-bands and garters and simple trousers and such.  I'm sure you've seen the same.  Does all that "prove" anything about Poser itself?  No.

 

I'll see that and raise stockings/shoes/pants that suddenly don't fit at all anymore if you shorten the legs in Poser (be it by scaling or morph), the perennial elbow poke-through (though to be fair, the better merchants put in fixes for that), and a whole host of fitting problems for anything that isn't a standard model (or sometimes even if you do use the default body shape). 

I think at some point it becomes less of a limitation of the app (except the scaling bit), and more a limitation of the merchant's skiills. 

I guess what I'm getting at is that these are not new problems, and they aren't limited to any one vendor, or even group of vendors.