Installing a 3rd party OS/Firmware on a WiFi AP has been done for decades already and is mostly expected. I don't want to run random self-made apps on my watch

Installing a 3rd party OS/Firmware on a WiFi AP has been done for decades already and is mostly expected. I don't want to run random self-made apps on my watch, I want it to work reliably at all times. And that is done by using APIs and frameworks provided by the smartwatch manufacturer. There are fully custom watch solutions where you can program everything from bare metal up yourself. Get one of those. --- As for the PS3 "general purpose" thing, it was 100% to get around EU tariffs. PCs were on a lower tariff than gaming consoles.