Yes, any consumer electronics that does not specifically use frequency, such as rotational machinery, would run fine. All consumer electronics devices have their own power supplies either built in, or connected externally (power supply adapters).

The question should be why not 400Hz for household power? There is nothing inherently right or wrong about 50Hz or 60Hz. Higher frequencies can work with smaller and lighter transformers and produced with smaller generators, but higher frequencies also cause higher losses during transmission. So despite their advantage, of lightweight transformers, utilities s did not choose 400 Hz. It's fine for transmitting power over short distances.

But you see, none of these answers my question(s).

Remember how power is produced? It depends on the rate of change of flux. Higher frequency means higher rate of change can be obtained with smaller cores. Hence smaller transformers and generators can be used for 400 Hz.
P.S. Another way of looking at it is from the perspective of energy conservation. The faster you spin the generator core, the more mechanical energy is put into the generator and hence higher electrical output. You can increase power output of a generator or transformer either by increasing flux or frequency. Flux can be increased by making the core bigger (thicker wires and thicker iron core), which makes the equipment heavier. By increasing the frequency, you can use a smaller and lighter core for the sdame power output.