"The 3.5mm headphone jack is one of the elder statesmen of the personal tech world, having become ubiquitous with the rise of mp3 players, smartphones, and other mobile devices" - maybe the author is too young to remember that, but I think the "mobile device" that really helped make the 3.5mm headphone jack ubiquitous was the Sony Walkman back in the eighties.
It's even called the "mini" jack because it's a smaller version of the 6.35mm "phone connector" which dates... all the way back to 1878 when it was used for manual telephone exchanges (!)