True, but I doubt very much whether that would often happen in practice, since both toasters and kettles 'switch themselves off', so that the socket switch is very rarely going to be used to switch 'on load'. Similarly with most other kitchen gadgets (mixers, blenders, etc.) which will nearly always be switched off with their own functional switches before the socket switched is operated.Switching a high power appliance such as a toaster or kettle ON and OFF using the switch on the socket can wear out the contacts in that switch leading to early failure of the switch.
Kind Regards, John