This is overblown. I think Apple's main concern is really centered around ensuring that due process takes place, and that the company isn't used as a shortcut to the established warrant process by law enforcement.
The first link is just a repeat of material from Dalrymple's original column where he incorrectly assumed he had "lost" a large amount of music and talked about weird issues with his music library. Turns out those kinds of issues were most commonly caused by a corrupted .itl file during the update, and were resolved by replacing it with the prior .itl file. The second link is labelled as "troubleshooting", but 95% of the content is just explaining the standard way to set...
Apparently you can create a secondary library as a work around to that prior to El Capitan. http://www.imore.com/do-you-have-over-25000-tracks-heres-how-create-secondary-itunes-library-apple-music-and-itunes-match
Although I've read a lot of generalized complaints about iTunes + Match + Apple Music being "confusing", I've yet to see a specific argument made that's very convincing about why it's "confusing". All you have to do is backup the music files on your HDD and never choose to have any of the apps delete files from your HDD and there's no risk of losing something that isn't limited to a Match subscription or an Apple Music subscription.
My reaction to Apple Music after a couple of weeks has been very similar to my reaction to the iTunes store when it first rolled out: it almost seems like it's too good to be true. One of the things that stands out about the service is the curated playlists and content that's generated by people rather than algorithms. I've already come across ALOT of artists that I missed in certain genres…despite regularly browsing those genres in iTunes with the 'Related' and 'Listeners...
IMO, the mini is a product that could easily be eliminated from the lineup. It was a sort of bridge product during the time that the 9.7" iPad was still considered "heavy" and Apple wasn't offering 4.7" and 5.5" screen phones. The introduction of a 12.9" iPad that sold for a premium and a modest price drop on the 9.7" iPad would seem like an opportunity to discontinue the mini.
Odds are very high that's exactly what it was due to his use of iTunes Match. It was Match users that were the most likely to have issues with the new Apple Music .itl file being corrupt. I never used Match and I didn't have any problems with my music library on update.
Just because they write an article based on the premise that it's confusing doesn't actually mean that it is. You can have cloud access to your iTunes purchases (free). You can have cloud access to music files on your HDD that weren't purchased through iTunes (annual fee). You can have cloud access to any song/album on iTunes regardless of purchasing it or not (monthly subscription). That's all there is to understand.
iTunes Match: makes non-iTunes music files available through the cloud. iCloud Music Library: makes iTunes music purchases not copied to your device available through the cloud. Apple Music: makes iTunes content that you never purchased available through the cloud. It's not really that confusing.
Yeah, and it was likely a very simple fix like restoring the prior .itl file. He never "lost" anything. I can understand that a corrupted library file after an update could be alarming to anyone initially, but it's kind of odd that an experienced tech writer would freak out that much.