Actually there are less expensive parts. The parts are more expensive per unit mass but I bet an iPhone consumes about 1/10 of the raw materials as a early 70/80s entertainment boxes. It still just plastic, metal, glass, etc. The old electronics probably used worse chemicals in production as well. The lithium ion battery is probably the one outlier in that it's unique to mobile electronics but old portable electronics would use dozens of non-rechargeable batteries every year.

That’s an opinion; not a point. A point would be some justification for why you think that.

I said it: they have lots of expensive parts in them. They rely on expensive rare earth metals that require lots of capital to extract, and leave wakes of destruction on the landscape. They require lots of plastics that remain inert for thousands of years. If one is spending thousands of dollars on these things, then they better last a long time. Instead we throw them out every other year and begin the cycle anew again.