Layered ignorance and incompetence from years of exponential growth, and linear education. I would also hazard a guess that the general disdain for understanding context and proven tech is another major factor.

I'm looking forward to the next decades, there's a demographic collapse on the horizon, global supply chain are weakening. The incentives to bring back manufacturing onshore will increase and that will require full understanding and will likely put constraints on supply anyway, just less so than a total collapse. Software will have to adapt and get all the compute results to a much better power efficiency.