Gravel bikes allow for riders to ride on mixed terrain, opening up a whole new world for cyclists. Wider rim design fit wider tires for different gravel wheels to suit the needs of those who love gravel riding, regardless of their needs.
The Aero rim shape is deigned to provide maximum forward aerodynamics while minimizing the effect of cross-winds (which will happen on windy days, or when cars pass you, and can destabilize you).