Here is a great example an amazing v-taper. His name is Artemus Dolgen. Minimal user, turned pro at 167lbs, but his training is spot on. His back isn't all that huge but you can see his waist is insane. Probably 27-28". He limits core work and seldom does abs. Wears a squeem to train his abs from distenting, and does vacuum exercises religiously. I think many here could benefit from swapping traditional ab work with vacuum exercises.
I think you make a valid point. I've heard so many in my circle that got their waist down by simply not working abs, which make them appear thicker somewhat. Thats how Arnold kept it tight but doing the vacuum exercises. I will have to give this some thought.