I just watched a documentary about John Deere making repairs impossible without software just like this. I don't like this idea. I think its reasonable on an iPad or an iPhone but I expect to buy a MacBook and have it last a while with me being able to repair it when it is out of warranty. Just changed the battery out on my 2011 MacBook Pro because it swelled up, I may be able to do that on a future MacBook.
I saw that Mother Jones report. Sure enough, Apple's legal staff was in attendance to discourage State lawmakers from preserving consumer liberties.
Hopefully, Ukrainian hackers will steal/copy/sell the diagnostic tool for compromised persons, like they did with John Deere.