When I was instructing in little airplanes, I always enjoyed the enthusiastic student. If today that means someone has time with FS, so be it. I'll work with the person to do him justice. I found a long time ago that a CFI has to adapt to each student's ability rather than the other way around. That's part of being a CFI, unless one has the pleasurable option of cherry picking his students to suit his own foibles on instructing. I never had that option.
Again, I feel any exposure to the art of flying is a positive development. My opinion doesn't make it right for every CFI, but it works for me.