WiFi does not necessarily need to call the manufacturer's server though.
You can always have a local server controlling the devices, on the same network, No internet access even required.
Even, you could have a private internet-facing server to control devices at different sites. Or have something form of tunnelling to connect different sites.
On the device side, you can pair a wifi modem with a micro controller, or even use something like the ESP32, where your application code can live next to the WIFi/IP stack.

... that the "Switch 2" might have a very similar architecture, and Nintendo is afraid emulators might require little work to get them to run new games, and eat their lunch.

Though shit. Development will most likely continue on a fork.

I pay for games I like, have hundreds of games on Steam, tens of games as physical media.
BUT, Im 100% for game conservation, I want to be able to play my old games when im old and retired.
I still play a game released in 95, and I want to be able to play Mario 3D land in 2040, even if my switch's OLED screen, joy cons and battery have degraded.

I will donate to the next emulator that surfaces and gains traction.

If they are quantum dots, can you even observe them? Or do the become regular dots when observed?