I have the 2015, 2017 and a 2020 and they are pretty much all the same that way. None need a power source for normal workdays, I don't have a camera that needs to have memory cards swapped out, and all presenter displays are either ClickShare or AppleTV and thus wireless. I don't accept random mass storage devices, and for those few times that I do want one I use a multiport adapter which works with both the 2015 and all the newer ones (USB-C and USB-A connectors), which I also use for when WiFi is down and you need Ethernet. It's not much bigger than any Ethernet adapter anyway.