Well, my printer is not wireless, it is very wired, and I also use a Superdrive (as I am the sort of person who still buys CDs, rips and burns them, and watches movies - occasionally - on DVD).
My original MBA had one USB port, which was an inconvenience; the current 13" has three, whereas the wonderful 11" had two; three are nice, but not terribly necessary, - but two is the perfect number.
The terms Magic Mouse and AirDrop are completely new to me - in that I don't know what they are.
The G-Drive USB-C external drive sounds interesting. What exactly is that?
One can use the Superdrive with the 12" rMB; I have done so a couple of times, actually! It works with the Apple adapter (but not with ALL adapters, so one has to be careful about that when considering the purchase of a third-party brand). I still buy CDs and DVDs, too. Also I download albums from iTunes and then like to create my own playlists and burn them to CD for the car. Couldn't manage without my Superdrive!
Yes, I remember the first-generation MBA (I had one) and most of the time the one USB port didn't bother me much -- until the time I wanted to download images I'd just shot from my card reader into my external drive -- both devices were using USB 2.0 at that time. Oops....I quickly realized that instead, I'd have to first get all the images into the MBA itself and then unplug the card reader and plug in the external drive in order to get the image files where I wanted them. Since I had a number of images to transfer it was a royal pain and the whole process seemed to take forever. I vowed never to make that mistake again.....
Times have changed, of course and since most everything is wireless and since I do have other Macs in the household to use, too, I'm not as fussed about that sole port as I otherwise would be, and if I were to take another photo trip where I'd be doing a lot with shuffling image files around, I'd take my 13" rMBP instead. On that machine I can easily plug in two USB 3.0 devices at the same time and do my thing.....
The Magic Mouse is the rather sleek, elegant looking wireless (Bluetooth) mouse that Apple brought out several years ago; the first generation required that one insert batteries (rechargeables were great!), but with the current version I simply plug it in for recharging at a time when I'm not using it (usually overnight) and it works a treat -- no more batteries to keep track of and carry around. Haven't used a wired mouse in years...... I'm a mouse person, never really felt wholly comfortable with the trackpad, especially for attaining precise results. Now I sort of do a combination of trackpad and mouse, using each device as the fancy strikes me. My 15" rMBP functions as a desktop substitute so also have the Magic Keyboard and Magic Trackpad to use with that machine.
Air Drop is Apple's app meant to make it easy to wirelessly and without additional devices transfer files to another of one's computers or to a friend's/relative's computer if their machine is close by. I haven't really used it all that much, to be honest. Just as easy to use Home Sharing (in iTunes) or to pull out an external drive.
The 1 TB G-Drive USB-C external drive is bus-driven and has the USB-C port on it. The great thing is that it comes with both a short USB-C - to USB-C cable for direct connection to my rMB and a short USB-C - to USB-A cable for direct connection to my rMBP. That way, I can plug the thing into my 15" rMBP and snag a folder, file, whatever, and then turn around and connect the USB-C to USB-C cable to it and stick it into my rMB for quick transfers. I was happy to see that the USB-C to USB-C cable also works VERY nicely with my tiny little Samsung T3 external SSD drive as well. When traveling I can carry the T3 and have the contents of important files that aren't necessary to have on the rMB itself but which I might find that I need anyway. Also this provides plenty of extra space for adding new files while on the road.