The last time this conversation came up, somebody pointed out that the square type B connector used on the Uno/Mega is still used by USB printers
As you would expect. The argument that the smaller connector would be "more durable" is certainly counter-intuitive.
And then there is the "mini", used on disk drives, hubs and all sorts of widgets.
though they seem to be the last holdout, and most things have gone to the micro-B plug ... Part of this is the European law that mandated micro-B as a standard for cell phone chargers.
Where "most things" means phones and tablets. Which makes perfect sense. The flimsy connector on an Aldi mobile phone which looks
like a micro B but isn't, and breaks easily was rather annoying.
I've seen complaints that the micro B connectors tended to rip off of electronics more than the mini B, but with the exception of stuff from Adafruit, all of my USB gadgets have been micro B for the last few years.
But therein is the trick - in your
hands or most of ours, this may well not be a major problem.
The 5.5x2.1mm co-axial terminals seem to be heavily used for security cameras.
And modems, and network switches, and many other things. But there are many
variants, especially on laptops, some ridiculously
small such as on my ASUS EeePC here!
The retention strength and make/break rating of micro USB is far superior to any other USB - look at the specs instead of personal opinion - just like a component the datasheet/specs are the go to for information, not personal opinion. Micro USB has a passive latching mechanism which increases retention force but which allows removal without active user action. Micro USB is rated in excess of 10,000 insertion cycles vs 5,000 for mini and 1,500 for standard.
As for the micro USB connectors ripping off, that is nothing but shoddy, amateurish soldering, not a design flaw. Micro USB is designed to reduce the mechanical wear on the device; instead the easier-to-replace cable is designed to bear the mechanical wear of connection and disconnection. The Universal Serial Bus Micro-USB Cables and Connectors Specification details the mechanical characteristics of Micro-A plugs, Micro-AB receptacles (which accept both Micro-A and Micro-B plugs), and Micro-B plugs and receptacles, along with a Standard-A receptacle to Micro-A plug adapter.
Everyone is entitled to their opinion, but that does not change the fact that micro USB is far superior to any other USB connector to date. All other USB connectors have been deprecated and the only one recommended for use today is the micro. Any company using other than micro USB is not following best engineering practices.