Over the last few years, Apple has been taking the fight to third-party repairs with various legislative moves against the "Right to Repair".
This software, called Apple Service Toolkit 2, is only provided by Apple to its Authorized Service Providers, and without it, any repairs to the aforementioned parts will result in "an inoperative system and an incomplete repair".
Locked computers will only run after an Apple authorized service center runs diagnostic software named Apple Service Toolkit 2 on them. Right to repair legislation would ensure that third-party repair houses have the instructions and components necessary to properly fix consumer devices and better allow people to make fixes on their own. Failure to perform this step will result in an inoperative system and an incomplete fix.
The new proprietary software diagnostic tools that Apple is planning to release to help fix MacBook Pros and iMac Pros will mean that you will end up with an "inoperative system and an incomplete repair" if they are not used in the fix process of the machine. It will mean that you will be forced to pay whatever Apple demands when your machine breaks as Jobs' Mob is effectively killing off any competition.
It has released a post in which it asserts that its group members bought a brand-new 13-inch MacBook Pro (with touch bar), disassembled it and replaced its display with that of iFixit's original torn-down MacBook. For the iMac Pro, it should apply once the Logic Board or flash storage is replaced.
For the MacBook Pro, if any repairs include the display, logic board, TouchID, or the top part of the case, which includes the keyboard and trackpad, and the Apple diagnostics are not run, this will end up causing your laptop to stop working. This is evidenced by an internal document received by MacRumors and Motherboard resources, write "Contracts". Apple has yet to comment on the report, but considering the controversy inherent in this story, you might hear from the company soon.