[eurg]

Modern fridges have temperature sensors, per-drawer ventilated air-cooling, auto-detection of when particular high-thermal mass un-frozen food (i.e. a turkey) is added and start quick-freezing, and provide alarms when door or cooling fail. Also, energy efficiency for the EU A+++ rated units is really good.

And you get that already for the cheap units.

So, it's a freezer, it freezes, and it doesn't send a post to Facebook. The only complaint I would have is their loudness. Modern extra-slow compressors are often (perceived) louder than previous-gen units.

Also: given that even DIY ovens usually start with "get a cheap PID controller from e-bay", I doubt that commercial ones use anything else.

[rdtwo]

My fridge is modern but pretty simple. It’s really just a freezer with a vent that regulates fridge temps. It’s got some othe functions like defrost and seal warming but it’s a remarkably crude device