Hi goldem,
I’m not clear why you think it would be a variance from any of the guidelines in the site or which guideline you are referring to. The type of materials in a mattress or in the comfort layers are strictly a preference choice (as long as they are good quality and durable materials) and there is no “better or worse” combinations except based on the preferences of each person.
As long as a mattress is a good match for you in terms of PPP and the quality of the materials are good and there are no “weak links” in the mattress (which there aren’t) then the rest is really a matter of personal preferences based on which of the criteria of your personal value equation are most important to you and how it compares with any of your other “finalists”.
Could you be a little more specific what you mean? Perhaps I’m not understanding what you are asking.
Phoenix