nano is great in that it is easy to learn, but it also not nearly as powerful.
An example as a sysadmin modifying/working on a log file (columnar data) -- If you want to work on lets say, the first 8 characters of a specific block of text across multiple lines, how would you select only those 8 characters on each of the lines without going one by one in nano? With vim, you have visual block mode, which makes selecting this columnar group easy, and then you can run your command operations on that selection only.
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