Small engines generally need more service than larger ones. This is mostly because large engines are not pushed as hard relative to the size because the buyers want a reliable engine.

A tractor with a 600 horsepower engine would have around 19 liters. GM can get the same 600 horsepower out of 6 liters. I know motorcycle mechanics who can get that power from 1.5 liters. Of course the motorcycle mechanic will tell you upfront that you will have to completely rebuild the engine every 40 hours. GM knows that even though the engine can deliver 600 horsepower it will only do that for a few seconds and then have plenty of rest time at much lower power output to cool off as a result they can get several thousand miles. Tractor manufactures know that their customers will use 600 horsepower continuously all day, everyday with no breaks to cool down so they build for that spec.

Point is I expect the engine in this car is designed to not be as reliable because of the weight/size vs reliability trade offs they can make. It you mostly use the car in electric mode with a few long trips it won't matter overall. If you typically take long trips (without stopping to recharge) get a car with a larger engine.