Std. 2 is about clear communication more so than details of the property. Are such details driving value? Likely most are not.
As with a lot of things appraising.... it depends.
First off, the user's don't give a rat's butt about USPAP. Yes, in their engagement letters they have a blurb that acts like appraiser's boilerplate stating the appraisal must be USPAP compliant. Other than that, they don't really care.
Do materials and material grade drive value? Depending on the area and neighborhood, absolutely. Other areas, builder grade, Home Depot stuff suffice and it's not as important.
Malibu, Beverly hills, Holmby Hills, Bel Air, Etc. A description of the materials and features must match the quality rating of the dwelling. If you don't list them within the report, it's like calling the borrower's kids ugly. Conversely, if some flipper is putting Ikea cabinetry and appliances in one of the aforementioned areas, this has to be called out and explained matching the lower quality rating on what is typically conforming in the neighborhood.
But you're right, "most" areas have a mid-tier construction rating and it's all about the GLA, room count, utility for the area, etc.
My voice recordings along with my cell phone video was more "for me" to help with describing the subject property and the description of the improvements. This level of detail does not appear to be wanted anymore.