I wouldn't see bonding as part of the issue because it's connected to the surrounding pipes and wouldn't be disturbed usually.
Many geyser elements don't actually have any wiring as such, the thermostat is wired and it pushes into the element with spade terminals basically like a plug and socket. Are you saying a plumber shouldn't be able to pull out the thermostat to allow the element to be replaced?
What about an interior designer who wants to install different coloured steel fascia plates on the switches or sockets in a room? The fascias are electrically speaking a part of the circuit because they're connected to the CPC via the chassis of the switch. Would they need to call an electrician?
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