If I loosely quote Louis Rossmann, one of the issue of right to repair is that more and more companies (Apple leading the trend) are using slightly modified chips from manufacturers, and them make then sign contracts that prevent any part selling to anyone. So technically even you can replace those chips, you can't buy them. And next Apple if putting serial numbers to prevent that even if you get the part, you will h…
And I am not entirely sure if it is a good idea Apple sell these parts for repairing. Which Apple will definitely do so with their hardware margin. i.e They will sell you the Display Screen with Glass for $300+. At this point you might as well go to Apple and fix it.
I had always wish the Services Strategy of Apple was to raise the price of iPhone and Mac by $100, move those to Services Revenue and included AppleCare+ by default. Also lowering any replacement and fixing price rather than try and gouge their customer at their Genius Bar. Which is increasingly a thing since 2015.
Getting third party fixing also have risk when your Data aren't fully backed up. Which is something likes to push for their iCloud Services.