The only person who would ever think that having an isolation switch in plain view as a preferred option is an electrician or geek. And don't get me onto grid switches. In the last 10 years in my kitchen I have never had to turn off an appliance quickly, and if I had, I could have isolated it by either using the plug in the cupboard next to the appliance or using the functional switch for the circuit in my consumer unit. All appliances are fed from switched single socket outlets in the adjacent cupboard and I always fit kitchens this way. Modern appliances are generally low power consumption so don't sweat the small stuff, put it all on a kitchen rfc, get those switches hidden away, forget about them and move on.