Such complete panelling as described above isn’t necessary for the built-in variety of kitchen appliance as they will be completely incorporated into the kitchen unit. Built-in appliances will feature different design quirks that enable them to be integrated into a variety of kitchen set-ups, while appliances such as washing machines will be designed in such a way as to not transfer vibrations to the surrounding fixtures.
It’s also worth pointing out the difference between these built-in appliances and integrated appliances, as there can be some confusion. In basic terms, an integrated washing machine will feature an additional cupboard door on its front, while built-in machines do not have the additional door. This extra door requires some adjustment in terms of design and fitting, but for repairing purposes both built-in and integrated appliances are pretty similar to each other.