Getting into skystriker. Why so few maindeck monsters?

Getting into the skystriker deck after it's massive support wave on Master Duel but I am quite perplexed by the builds for this archetype shown by other duelists. Namely why so they run such an extremely lite monster count for their own archetype monsters. Are they really that bad? How come I often see lists only having ray and roze, sometimes zero roze, and virtually no other sky strikers?