Avoiding a monopoly of a single launch vehicle has been an explicit goal for decades. For example the EELV program always wanted to have 2 rocket families (even

Avoiding a monopoly of a single launch vehicle has been an explicit goal for decades. For example the EELV program always wanted to have 2 rocket families (even it meant using funds inefficiently... eg paying ULA to keep making both Atlas and Delta even when their capabilities pretty much overlapped)