Why yes I do, it is hardly unusual. For over 100 years Gillette have sold razors below cost and made their money selling the blades. Same with Nescafe and their Nespresso pods, and Nintendo and their game cartridges (or whatever games come on these days). As somebody keen to flex your knowledge of product marketing to the rest of us, I am surprised you are unaware of this common wheeze 
. It is probably good business, but not in line with FW values, IMO. And that is why I air it.
What market research proves an extra mil at most to make the 16" model compatible with laptop switches from the likes of Cherry, would ruin it? And is this more plausible than speculative intention to keep the keyboard design proprietary, or at least hard to replicate by third parties? I link to Cherry’s product to allow other readers to decide for themselves; note that 3.5mm is very close to the purported overall FW key module thickness.
My dog in this fight is a desire to see an Atreus (or similar staggered column) ergo design brought to market. Making it harder than needed to prototype or build modules at low volumes reduces the likelihood this will happen. We are dealing with very small measurements here which is what makes the decision not to accommodate commercially available key switches quite frustrating.