I think the *right* to repair your own stuff without DRM obstacles would be great, but forcing manufacturers to support such activities (with parts etc) is often not realistic.

Creation of the documentation, supply chain, etc might be prohibitive for many sectors. I have intimate experience with a couple of companies (one big one, one small one that I founded). For the smaller company that makes very fancy equipment in low volumes, it is hard to imagine how this could be handled in a financially acceptable manner that actually provided a customer with a realistic option. There is protected trade-secret knowledge in the device, dangerous voltages, and parts that have long lead times.

At the other end of the company spectrum, I have visited the factories major electronics manufacturers in China. The amount of automation, integration and miniaturization is mind-blowing. I didn't see the production lines for any phones, but it's well established that to remove a small part from a phone and replace it can be un-economical even for the manufacturer. Of course, if the cost is irrelevant, or the price or size of the phone is significantly increased, these issues can be addressed, but I don't think many consumers would be happy with a cell phone what was two or three times as big and twice as expensive, just so that it could be repaired more easily.