I doubt that happens any more. The whole unit will get swapped out instead. They are not repairable. Everything is glued in and not removable.
I've had a fair amount of apple kit - I've found it to be hideously unreliable, clunky and of dubious design. Detail things such as power isolation is not possible which bit me hard after I had an MBP catch fire just out of warranty.
I don't buy the whole quality argument. Its a perception - not a reality.
I don't know what they do if you ask for a battery replacement or when something's wrong with the SSD, but changing a display on my 2011 MacBook Air was a matter of 20 minutes. I'd be very surprised if you couldn't at least replace the moherboard.
Which, by the way, is the only type of repair the other laptop manufacturers ever offered to me.
You really don't have a clue what the rest of the OEMS are doing. Anything at the ultra book level is essentially two pieces. Your huge mega laptops are still user serviceable (like a bricky T class), but not say....a carbon.