I don't know how it is in other areas of technology but in the automotive electronics world, a big barrier to re-use and repair is mostly poor record keeping. When an OEM makes a car, they buy subsystems from suppliers such as Bosch, Continental and Valeo. These mechatronic assemblies contain software that is often completely opaque to the OEM, never mind the end user. Even if you did want to repair the sensor or whatever has gone wrong, you wouldn't be able to access the diagnostic interface without specialist tools and documentation. This barrier is deliberately and cynically inserted by witholding the information. Our machines are not made to be repaired because it is less profitable and profit decides every decision in capitalism.