It's important to emphasize the blog writer is on a Mac. I noticed a long time ago there is more of a "do or die" timeline with their OS upgrades than on Windows.
Note that Mountain Lion, his "outdated" O.S. was released 4 years before, to be followed by its successor, Maverick, 18 months later
. You read that right --
18 months! I call that madness, by any reasonable standard.
Now compare Apple's timeline with Windows release dates: Win 7 - Oct 2009; Win8 - Oct 2012; Win 8.1 - Oct 2013; and finally, Win 10 - Jul 2015.
There are lots of folks here still happily using Win 7 (now at 6 and a half years old). I'm on Win 8.1, and have no plans to go to Win 10 until I build my new DAW sometime next year.
Honestly, after reading that blog, the only thing I came away with was that I'm glad I never jumped on the Mac "loco-motive". (Reminds me of the trains in India that don't stop at the station, but only slow down so passengers can get on or off. If you're too slow, you get injured or die).