Uh
What? Top tyranid lists at the moment are something like 40 Hormagaunts and 30-60 Termagants. Drukhari causing them to pivot to 60 Termagants instead of a Dimachaeron.
Genestealer Cults have no elite infantry units to pivot to. They can't, as a concept, get away from spam.
And Imperial Guard not having masses of infantry seems deeply, deeply wrong.