The simplicity of EVs is one of their big strengths! Compare all the cooling, transmission, lubrication and fuel systems of an ICE car to the simple Electric Motor of an EV. Vastly simpler. As an end user, I see it to, my EV has no scheduled maintenance, whereas the ICE wants me to take it to the dealer every 20k miles.
Mechanically simple, yes. Electronically simple, no.
To be fair, modern PV cells are purely solid state (no moving parts, no lubricants or coolants), so a solar system shouldn't add a scheduled maintenance burden, just add to potential unscheduled maintenance costs in worst case scenarios.