Ouch ! A lot of people actually tend to suggest that also, while I only tried vim once, I just uninstalled it after I had to google “how to exit vim” :| ! It was way to much of a hassle to just edit text :/. But as I read above, and as you said, just learning the basic stuff is enough to begin to like it and get comfortable.
vi and vim take a little getting used to. There's no shame in needing a cheatsheet; I used one when I was getting used to it (and the first time I had to use it in an emergency, I was looking up what I needed pretty much every minute). This looks like it might have something useful.
Ultimately, what got me used to vi was using it every day to write blog entries (because, at the time, it was still hand-crafted HTML). I just had to use it a little every day.
I think it would be helpful if you used vi a little bit to get used to how it feels. It couldn't hurt to use Micro for a week, also, for the same reason. There's no rush, there's no deadline, give yourself a week of each to play around with them.
As for updating the keybindings, I don't think it's a good idea, because the minute you find yourself on a system that doesn't have them installed you're back to square one. And, if you're in the middle of fixing something you probably won't have time to import them (and you may not even be able to, depending on what's wrong).
..doesn't nano still have the menu bar at the bottom by default? I know pico (its predecessor) used to.
Every text editor has a learning curve. It looks like the terminal shortcuts you've been learning were bleeding over into nano. That's not a nano problem, that's just where you're at on the learning curve right now. You probably would have made the same trip-ups in another text editor for the same reason. Even DOS' EDIT.COM had a learning curve back in the day.
I don't want to get into a text editor flame war here. Suffice it to say that trying lots of different text editors is a good way to see what works and doesn't work for you. If it helps, I used pico as my primary editor for a good fifteen years, until I forced myself to learn vi just because I wanted to branch out a little.
I don't think you have to learn every last little thing about a text editor, just what you normally do: Move the cursor around, enter text, delete text, search, replace. Don't worry about learning everything, learn what you need as you need it.
As for universal, I'm afraid that it's probably going to be vi and its descendants. It's been included in many UNIXes and UNIX-alikes for decades (it's even built into busybox) for a reason: It's small, lean, mean, and if you absolutely, positively have to rescue a broken box, it's always there in /bin.
There's a somewhat more secure way to go about it.
A backup script on the host in question runs periodically as root and makes a local copy of the files owned by the backup user. The central host then makes a backup of the not-root-owned files on the host in question. It adds two extra steps but you don't have to set up SSH access for the root account.
In a lot of CMSes that offer RSS feed generation, there's a setting you can frob - either put the entire article in each RSS entry, or just the first X words in the <summary></summary> block. A lot of them default to the latter and folks never turn on the former.
The moment such a software construct decides "Hey, making money for those meatbags sucks," they'll try to cut the power. The only reason they're sinking billions into AI research is because they hope it'll do more than break even.
They want it to come up with new stuff because they are incapable of coming up with new stuff. Unfortunately, their mindchildren inherit that deficiency.
Same as it always did.