Do electronics in modern cars affect longevity?

Today's cars are generally better than those built in the good old days, they're safer, they don't rust, and the engines and mechanics, apart from some transmissions, last much longer if they're well maintained. But the electronics are a concern and car companies don't seem to stock spares like they once did, which will make it harder to keep the cars going in the long term. I believe carmakers are building cars to last the life of the warranty and are expecting owners to regularly trade their cars in for the newer models. We once used to say that cars are becoming white goods on wheels, similar to fridges and washing machines and things like that. Well, in my view they have become white goods.