I know well enough my way around vi, because although XEmacs was my editor during the 1990's when working on UNIX systems, when visiting customers there was a very high probability that they only had ed and vi installed on their server systems.
Many folks nowadays don't get how lucky they are, not having to do UNIX development on a time-sharing system, although cloud systems kind of replicate the experience.
Ed is the standard text editor.
Doing edlin as high-school typing exam was already enough, and ed wasn't much better, which was an opinion shared by our customers back then.
And not installed by default in many distros. FML.
> And not installed by default in many distros. FML.
ed (pronounced as distinct letters, /ˌiːˈdiː/)[1] is a line editor for Unix and Unix-like operating systems. It was one of the first parts of the Unix operating system that was developed, in August 1969.[2] It remains part of the POSIX and Open Group standards for Unix-based operating systems
so it is a bug in those distros.