A lot of people learn vi out of necessity. Eventually, they have to SSH into a server and have to make minor changes to files where it's quicker to do it right

A lot of people learn vi out of necessity. Eventually, they have to SSH into a server and have to make minor changes to files where it's quicker to do it right there rather than use FTP or VCS. If that's the case, all you really need to know are the basics that the OP mentioned. After that, it's up to the person's personality to decide if there is value in learning further and more complicated commands.