Advantages of pointed arch structure:
Because it is pointed, the weight is channeled to the ground at a steeper angle, so the arch can taller.Does not need heavy masses of material, as long as the ribs (major points of intersection) are reinforced.
More openings can be used, & so more light comes in.
Stained glass was used to admit colored light.
(Nave, Reims Cathedral, France, c.1211 - 1290.)