My feeling about "Right-to-Repair" is that it would be illegitimate if we abolished intellectual property laws, which are incompatible with conventional property rights.

However, I don't see any reason why two parties couldn't agree to a transaction that comes with a condition that repairs must be done by the seller.

Undisciplined

Not really a "technology" per se, but related to what you said, I'm excited about the "right to repair" movement.  Sadly, I don't think the movement is that mainstream yet, but I agree with its principles. When you buy a product you should own it and be able to repair and configure it how you want.  Maybe Google's Web Integrity Environment project will push people towards thinking about this more...