21 tiles recommended....that's CAD$42 plus tax...for what's the function here?

It has to do with multi-product cycle / recycling lifespan:

We don’t seem to have a similar chart of this (from the FL13):

Part of the reasons for user buy-in with the FL13 was due to sustainability. Recycled aluminium, recycled plastic:

The design of the case I posted didn’t fully matter on the exterior side. Because I point I was trying to make was that $42 CAD can buy my 80% of the case, the material, which has metal plates (on the inside). i.e. It was a material cost example.

Did I say that, or someone else did?

I get that you may not have followed Framework from the start, but Framework started their mission with environment and sustainability pretty high up on their mission (based on their own publications)…during their user-buy-in / sales pitch phase.

With the Framework Desktop, there’s no mention of recycled material on the product overview page.

Other brands, Acer, for example, also have been using various mix of recycled materials. Mind you though, even then, recycled plastic has limited lifespan (if recycled…this alone is a big questionable pre-requisite)…essentially waste with an expiration date.