I think that's likely true. But interestingly it doesn't, theoretically, have to be. In principle the combination of a multiple factors, each of which would m

I think that's likely true. But interestingly it doesn't, theoretically, have to be. In principle the combination of a multiple factors, each of which would move us significantly away from the global maximum (therefore constituting "problems"), might put us at a local maximum where removing any small number of them might leave us worse off.