I agree about particles from steel wool probably falling into the machine and causing major difficulties with expensive machines. I never even considered doing it when I read the suggestion.
However, if I recall correctly, the person who made the suggestion was from Brazil. I'm sure many products we take for granted in the USA are unavailable there. My guess is she was trying to find the most sensible help with extending the life of her needles with what she has available there.
M.Elizabeth