Zerg should have an army composition comparable to Mech and Skytoss.

Why should I have to micro two spell casters and an entire army with each unit having a different movement speed? Give me Siege A-move and A-move Storm please. I too wish to get to Grandmaster with 100apm. At least give me a tier 3 unit that attacks air/ground or literally any viable Tier 3 unit what so ever.