You are saying two very different things here. The stuff that we make today is built on millennia of knowledge - obviously it won't be trivial to understand or fix. That's not a problem - unless you want to force everyone back to the stone age.

Your second point is valid, a lot of stuff is shipped with stuff that isn't useful for end consumer or even anti consumer outright. The solution to this is to push for right to repair laws, patent reform, open source, etc and not decry modern technology altogether.