Water heaters should really have their switches nearby.Well, there's a water heater - that may be the most convenient place to turn that on and off.
We also have a washing machine - that could be plugged in in a cupboard perhaps, so nice to have a neat switch to isolate that rather than bending down searching in cupboards. No doubt the appliance itself has an on off switch, but nice to be able to completely isolate it, especially if there is a fault on it.
Same would virtually apply to the cooker hood and fridge freezer I suppose.
I think the switches make it a luxury job.
When washing machines have a fault they need to be pulled out to investigate. Any plug behind it can then be pulled. Same for fridge freezer.