Barrel jacks were awesome, they could go in any orientation. The only downside was the many different forms of barrel jack and lack of a standard. My question is: why isn't there a cylindrical USB port? You would be able to rotate it any way you want within 360 degrees!
As a matter of fact, why isn't there a cylindrical power plug? You'd get the benefits of a recessed plug like Type-C (EU) and Type-F (Schuko), you'd get the benefits of reversible plugs like Type-A (North American) and more so as you get 360-degree rotation, and it would be MUCH harder to break/bend compared to two flimsy pins (the UK plug has three thicker pins, but a chunky cylinder would be much more difficult to bend than the pins)
If it was a hollow cylinder (a bit like a vacuum-insulated water bottle), you could feasibly fit some small electronics in it, so things like flush low-power USB chargers and smart home sensors could be made.
The contacts would likely need to be outside the cylinder, similar to the "neutral" pins on Schuko plugs. There would likely need to be some plastic tabs to keep the power bits from touching the non-power bits, and then the socket itself would be able to freely rotate.
Actually, why don't regular sockets freely rotate? Then it would solve all the issues of non-reversible plugs not able to go upside down and reversible plugs not able to go sideways.
Speaking of cylindrical objects, what happened to camcorders? They sound like the most comfortable and easiest way to record videos, with straps and everything. They were compact, portable, and wasn't heavy as all heck.
this is my rant about cylinders, thank you for your time.
oh yeah usb has loads of pins for data. no wonder barrel jacks were never used to transfer data…
oh yeah designing an idiot-proof power plug that can be rotated 360 degrees would be challenging ad well
Oh you sweet summer child. As someone who bridged the gap between analog and digital sensing systems, I assure you, they were. I think it would be hard for almost anyone who grew up/ technically developed in the all digital age to believe some of the wack-ass shit we used to do to make things work. I had a technical career in the military in the period of transition from basically hybrid analog/ digital systems, to mostly digital systems. There were PLENTY of systems that used something not any more complicated than a barrel jack for doing so. Power, communications, you name it. But these were very simple systems relative to what we do now. And the reason why matched your thinking throughout this post. They are incredibly robust, simple connectors. They can rotate without issue. They are incredibly common and can be widely versatile. They are basically bullet proof, and if need be, I could solder in a jumper or just pinch a couple wires together holding my fingers to make it work if the cable were to fail.
IIRC, and I'm long in the tooth so it might be a bit muddled, I remember it taking almost 2 days for one computer system to warm up (to quite literally warm up physically to temperature and become stable), and when we had to load the operating system, we used reel to reel digital audio tape. You quite literally had to manually move the tape back and forth to find the start byte sequence. And that system used a headphone jack to give you a digital output display (not entirely; the computer and display system for had to do the analog to digital conversion).
Round connectors were absolutely used to transfer data, for example audio and video in the form of RCA plugs and many other examples back in the day. Another example is coax cable for TV signals (both analog and digital) and also LAN.
However the lack of distinct interface channels leads to a bottleneck in bandwidth. So as the need for bandwidth increased many of those were replaced with multi pin versions. This is much harder to do with round connectors and there isn't that much benefit, so they mostly got ditched.
However round connectors still have their place, for example tiny little coax connectors found in many devices to carry signals. Wifi antennas and such are connected this way.
Coax has only 2 conductors and it keeps impedance constant, unlike audio jack
The 3rd gen iPod shuffles used the headphone port for USB, definitely uncommon though.