Hi TD-Max,
I think you hit the nail on the head here … and this is also a cultural issue based on what people in North America have become used to sleeping on (and what their backs have adjusted to as well). The era of soft pillowtops has created lots of back issues (and lots of durability issues) IMO. This is what I call a “learned posture” and it an be difficult to correct. It’s like someone that gets used to having bad posture such as hunched shoulders or slouching and it can be difficult to correct it without discomfort or even some pain during the transition period from bad posture to good posture. There’s more about “learned” posture in post #7 here.
When the PLB mattresses first came out their initial videos (which are no longer available) implied that they would be doing this and I think I mentioned before that I was impressed. this layering became “lost in the shuffle” of incorrect specs that were published on the internet. It’s not so common (outside of firmer quilting layers which are a form of dominating layers which are more often used) that you see dominating layers in a mattress and it has a unique feel and performance that many people like. It’s interesting to me that you have caught on to this and designed your mattress around it. It’s certainly not a “recommended” construction by many foam producers who tend to suggest progressive layering but I think it has a valuable place.
In a sense this is similar to some innersprings which have a dual spring rate (a softer section and a firmer section) and I think that the performance and “feel” that can come from this with the foam layered on top of this type of spring is part of the reason why some people do better with innersprings. There is more about dominating layers and how they may compare to innersprings in post #2 here and post #16 here.
Thanks for your comments … and you bring up many interesting issues in your posts 
Phoenix