Do you have numbers for the maintenance? Consumer Reports and insurance companies claim that maintenance is expensive for Teslas, even among luxury cars.
Any mechanical product with 1000s and 1000s of parts made by complex machines also, with 1000s of ways to make mistakes is going to have lots of opportunity for problems that need fixing.
EV gets rid of a ton of leak points compared to ICE. All the normal wear and tear stuff is exorbitantly expensive with Tesla because of how few shops can service them and you usually have to go through Tesla for parts.