Like I said waaaaaaay upthread, both styles have their advantages and disadvantages.
IMHO, the greatest advantage of a fluff-first RPG design is it sets the parameters for the mechanics. This is especially beneficial when working with making an RPG based on someone else's IP. Most of the time, I'd rather play an RPG designed to fit a novel's (or movie's, or videogame's, etc.) fictionverse than a licensed edition variant RPG sourcebook for an extant game- sorry GURPS!
OTOH, a well-designed RPG system CAN be used to model a wide variety of genre styles- HERO, GURPS and M&M win here- even if they don't do everything well.
In addition, an inflexible mechanic may still suggest a certain kind of gameworld. The hoary class/level system does a poor job of modeling supers, but it does have a certain resonance with more stratified, quasi-Medieval settings. IMHO, of course.
Ditto alignment systems. They may feel out of place in a modern game, but when "divine" beings can walk the Earth, that "good" and "chaos" may have tangible, long lasting and concrete effects on all aspects of life doesn't seem so out of place.
IMHO, the greatest advantage of a fluff-first RPG design is it sets the parameters for the mechanics. This is especially beneficial when working with making an RPG based on someone else's IP. Most of the time, I'd rather play an RPG designed to fit a novel's (or movie's, or videogame's, etc.) fictionverse than a licensed edition variant RPG sourcebook for an extant game- sorry GURPS!
OTOH, a well-designed RPG system CAN be used to model a wide variety of genre styles- HERO, GURPS and M&M win here- even if they don't do everything well.
In addition, an inflexible mechanic may still suggest a certain kind of gameworld. The hoary class/level system does a poor job of modeling supers, but it does have a certain resonance with more stratified, quasi-Medieval settings. IMHO, of course.
Ditto alignment systems. They may feel out of place in a modern game, but when "divine" beings can walk the Earth, that "good" and "chaos" may have tangible, long lasting and concrete effects on all aspects of life doesn't seem so out of place.