Earlier quoted context omitted.
I have had just as many issues with things braking unrelated to the engine. Eg washer fluid bottle leaking, air conditioning, disk breaks needing replacing, tire sensors breaking, tires going bald, etc. Out of the engine related problems, the cam belt and clutch are the things that's caused issues in the last 5 years across my various cars.
Those are far easier to handle than, for example, changing a timing belt on a gasoline engine. Faster too... You need less qualified people, less time, less parts, less often for repairs that a handy person can often do themselves and save on labor and parts. Significant sources of income are therefore shrunk for dealerships.
Engine and trans stuff isn't a significant source of income for them though. If anything ICE specific parts are a break even waste of a bay because for every person dumb enough to have a dealer do a timing belt out of warranty there's another person getting some leaking gasket replaced under warranty. Dealerships probably stand to make more money on EVs. Independent mechanics will probably lose out some though.