I don't have a car (I ride motorbikes instead) but my wife does. I maintain her car, always have.
Oil change? What for? Because they say so? Because the warranty... wait a minute, warranty... that is for new cars, right? We don't buy new cars as that is a waste of money. We buy cars when they're about 4-5 years old, having done about 100.000 km. We get rid of them when they've done about 350.000 km, usually some 6-7 years later. The only time I change the oil is when she's run the thing into some piece of rock again, causing it to piss out the oil somewhere (this happened three times thus far...). Otherwise the oil stays where it is, topped up regularly but otherwise left alone.
We live in Sweden, where cars undergo mandatory inspection every year. This inspection includes an analysis of the exhaust gases for pollutants (hydrocarbons and carbon monoxide). No car I've maintained has ever failed these (stringent) tests, usually the values are at the low edge of what the equipment can detect.
Of course this is all anecdotal evidence, and there are many reports to the contrary, but I claim that the whole oil changing ritual is no more than that - a ritual which once had value but has lost it due to the quality of modern oil and filters (which I *do* change) and the cleaner-burning engines and fuels. It also helps that we run most vehicles on a mixture of ethanol and petrol, with up to 85% ethanol (E85) in some. Yes, there are reports about all sorts of bad things which ethanol will do to your engine and oil. Strangely enough I have not noticed anything of this sort, but that is - again - just anecdotal...
The biggest engine-related repair I've had to do on one of her cars was the swap of a water pump on her current car. This was caused by a design defect (VAG engine, plastic impeller cracks, rotates freely around shaft).
I'm all for electric cars but modern ICE-equipped cars are rather trouble-free, at least the ones I've worked on.