I don’t think manufacturers are purposely making the cars harder to repair - they have to meet stricter and stricter fuel and air quality standards, so need more and more tech to squeeze out more /same performance while burning less fuel, or burning more thoroughly.
Sure. This is all self evident. Understanding the motivations of manufacturers, however, yields little value: the products they're making now are post-warranty disposable, despite the staggering cost and whatever intent manufacturers might have.
All of this has produced amazing ICE engineering. GM's base model gas truck engine, the L3B, is making 325hp from 166ci under 27psi of boost. Such ratios tell you everything you need to know about the long term fate of that drivetrain: there is zero margin for error, because everything is operating very near the limit of materials science and the capabilities of advanced manufacturing. When it fails, shortly after the warranty expires, fixing it will not be economic.
