[brk]

I'm not saying any of it is impossible, just that it is costly (based on my direct experience at a number of hardware companies).

For an "IoT box" type of product there would likely be fewer issues with the certifications and swapability.

For IoT devices like light switches, bulbs, smart outlets, or anything else where the 120V/240V power is exposed vs. isolated by a power supply (as in the case of a PC or "IoT box") it would likely be too costly to do in a conformant way. Particularly when the tinkerer consumer base that would actually value this is maybe 5% of the total market.