The schematics are already out there. The issue is its impossible to find parts. You can't take your 2 year old apple to him to get its screen replaced, because there are no screens available to buy for him to replace it with. Apple doesn't let the manufacturers sell them, apple doesn't sell them, and there aren't enough 'donor' screens from devices broken in other ways to satisfy demand.
Louis has done more examining than you give him credit for, while you ignore a lot of the real issues at hand.
Locking down car repair to protect car IP and having no parts available because your car manufacturer wants you to buy a new car or pay for a refurbished car directly...
Louis runs an Apple repair shop, so he complains about the availability of Apple schematics. Seems reasonable. It's not like the schematics aren't available, it's mostly the hoops you/he has to jump through to get them and even if he/you has them he might not be legally allowed to use them.
And this all ignores the aspect of you complaining about not having a service manual for a 500$ machine and Louis complaining about not being able to service a 1700$ logic board (which, if he can't repair it, might mean you have to pay full price to replace a 3000$ laptop).
Isn't it "China" that makes those MacBook boards already? They wouldn't need to clone anything, just make some more of them.
For example, a MacBook. Perhaps it's because China clones everything and would happily clone a MacBook board and sell that to unsuspecting people, so Apple doesn't want to share info on where they got parts or the schematics. You might disagree, and I do wish Apple would share this info, but Louis could at least examine this possible argument.