You're on most of it I reckon. Furthermore I'd place an emphasis on the learned helplessness of growing up valuing items which one cannot fix due to their prefabricated electrical nature.
The increasing complexity has engendered an attitude which reduces effort in the endeavour.
I say this because really all you have to be able to do is use the internet on a basic level to fix almost anything these days. I built a house, developed a trade, fixed my car, learned parenting skills, learned to play American football, learned to lift weights etc etc all just finding experts and adopting their advice.
I don't think I'm particularly capable but modern tech makes it so easy.
I remember having to order decades out of date books into the library to learn how to fix stuff in my childhood.