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Sometimes you don't even have the luxury of nano. Any moderately advanced Linux user should probably learn the basics of vi. Just knowing how to insert text and save it can fix a system that's stuck in recovery. Even if it's just to add a comment in front of a line in a config file.
I do like that some distros make visudo use Nano instead.
you can change that really easily
When does that even happen? If you have nano installed, wouldn't it work too?
Not in rescue mode. If you can't mount your root partition because something was fudged in /etc/fstab, for example, you may be stuck in recovery and depending on your distribution, it may not have nano in that minimalist mode.
For me it also happens when I install a VM of Debian using the small image, on my dedicated server in a data center. The company hosting the server requires a special network configuration and AFAIK, there's only vi. So i need to use the console to access the VM and from there, edit /etc/network/something with vi to setup the network. Once done I can reboot and install the rest of the software over the network, including nano.
I've been using Linux for more than two decades. Before nano I was using pico, but it also required to have pine/alpine installed. So knowing the basics of vi has often been helpful over the years for me.
Maybe it's because I like tinkering with VMs and SBCs, and most people will not encounter situations where they don't have nano, but it can happen. And you'll be glad to know at least "i" and ":wq!".
In a professional context, you might end up on servers that don't have nano installed, but do have vi. Or if you're helping out a friend on their laptop, they might not have the same software as you. Or if you often end up tinkering with random devices and/or setting up new systems it might be tedious to install the same applications every time.
It's basically an argument for learning the very basics of the most common editors so you have flexibility no matter where you end up. Even when you have the ability to download and install your preferred software, it's still an extra step that might not be desirable for a variety of reasons. But if it's just your own personal device, I see no problem with just installing whatever you prefer and running with it.
EDIT: Personally, I find that I don't end up using those other editors often enough to remember the abstruse commands of tools like vim, so I'm not worried about it. When it does happen, 99% of the time I can just whip out a smartphone and look up the directions for the n-dozenth time.
Sometimes you don't even have the luxury of vi. Any moderately advanced Linux user should probably learn the basics of sed. Just knowing how to insert text and save it can fix a system that's stuck in recovery. Even if it's just to add a comment in front of a line in a config file.