To me the last example is still simple. When I encounter this in the wild, I don't really care about preserving the header.

  tail -n +2 example.csv | sort -r -k4 -t','

Or more often, I just do this and ignore the header

  sort -r -k4 -t',' example.csv

Keeping the header feels awkward, but using `sort` to reverse sort by a specific column is still quicker to type and execute (for me) than writing a program.