I totally agree with Ashcat about "Engineers" and people's understanding of sound equipment.
I see a parallel with the early days of the motor car. In the very early days you had to be very rich to run a car or be a very skilled mechanic. By the time I started school, 1950s, a skilled working man could just about afford a car IF he had enough knowledge to change oil, set points, maintain a battery and diagnose and fix the myriad things that went wrong with cars. Even then, a major breakdown, big ends, suspension failure would be beyond his mechanical and probably financial resources.
Today, most people can run a "nail" and cars are so reliable that they need know little more than where to put in the fuel!
Jacks: Over here they are never called "phone" jacks and although the term jack should strictly be reserved for the socket, the plug is often just called a jack. In the network industry jacks are always just the receptacle and plugs are "RJ45" or RJ11 plugs.
We have the term "phono" plug which IMO always be instead called an RCA plug/skt and I tend to qualify jack PLUGS as TS or TRS plugs.
I am on a bit of a mission to teach people some basic audio electronics, but tis hard!
Dave.