They do have hop blends. CTZ and flaconer's flight at least, maybe other.
And I think I've heard of yeast blends, or at least wild yeast blends. Idk if I'd try that though, seems like too much variability with different batches.
Big breweries use malt blending all the time not for any other reason but large quantities of grain and supply and demand, I listened to a head brewer once saying they use a mix of 3 grains depending on the batch