As someone in manufacturing, you're wrong. Repairable things cost far more to manufacture. I have to have accurate drawings and records of manufacturing processes for parts, I have to have specs for all the little bits and pieces, and I have to have manufacturers who hold that standard.
If I'm not concerned about repairs, I just contract out based on function, bolt the thing together, and run it out the door.
Fridges are a great example. I can buy a cheap dorm fridge for $100, or I can buy same-sized Isotherm with a Danfoss compressor for around $1000. The danfoss compressor comes with all the diagrams you need, it's rechargeable, everything in that fridge is replaceable at a cost.
The dorm fridge - you can't even be sure that the compressor is in the same place from one box to the next.
However, when I'm stuck in port somewhere in Bogata, I can get parts for the Danfoss. I know I can. 10 years from now I know I will be able to get parts.