Cars are both more complicated and way more reliable. You used to spend a Sunday changing your plugs and points. Now your car lacks points and if the plugs last less than 100000km it's a disappointment. You used to need new clutch plates on the regular, now nobody ever needs them or if they do need them the car is a total loss because good luck getting to the clutches. On my current car the closest I ever came to working on it was replacing the wiper blades.