So many people missing the point here.
The right to repair is not designed to specifically enable individuals to attempt amateur repairs, it is designed to create a competitive repair economy where skilled operators can 'officially' repair devices. In any such scenario, of course the repairer will be liable for the quality of the repair - just like your mechanic is responsible for the quality of the repair to your car.
Yes, today 3rd party repairers use inferior parts and methods, simply because they do not have access to Apple's supply chain to get official parts - this law would change that.
It will create a better repair market where competition drives benefit for the consumer. There will still be 3rd parties who offer repairs with unofficial or lower quality parts - at a discounted price, but this is the consumer choice.
When I recently smashed the screen of my iPad Air 2 my options were only:
- Official Apple Repair with Original Parts: $299
- 3rd Party repair with 3rd Party Parts: $50
So I went with the $50 option and you know what, I'm perfectly happy with it. However in the future I hope there might be a 3rd option:
- 3rd Party repair with Original Parts: maybe $150
For some people this will be the right price vs. risk point.
Consumer choice and market competition is only a good thing and Apple's opposition to it is purely selfish revenue and profit driven.