well you're right about that..kind of.
the advantage of coilovers is exactly that, you can tailor them specifically to suit different tracks and different conditions.
but you can also find an ideal all around set-up including rebound and compression damping that you just can't do with adjustable shocks/springs. it won't be perfect for every occasion, but if you do mostly street driving with the occasional trip to the racetrack then you could do with an "all around set-up"
i guess i made my previous statement with the assumption that he's going to be auto-x racing every weekend or with any kind of seriousness. my bad.