> Wifi for anything but cameras

Buttons (key presses, remotes - think rapid input), Knobs, sliders, Pixel LED' strips, some MM wave sensors, ir/radio transmitters, really need wifi.

There is products where you will want a bluetooth proxy, plenty of kitchen/grill thermometers and scales for kitchen and bathroom are great examples.

Where range is an issue LoRa is a thing that has plenty of devices and is easy to DIY.