I saw a criticism of the alfalfa comparison because, given the circumstances, there isn't anything better to plant where alfalfa grows. That you'd spend more water growing corn in other places or something like that. If we want to deal with alfalfa water use, eat less red meat.

Not sure how legit it is, but there is certainly more nuance to water usage.

I prefer the golf course analogy, which uses 2-3x the water of data centers and has dubious benefit to society beyond the entertainment for those who can afford the "green" fees