Show me actual statistics that a supermajority of new and proposed datacenters either are currently using (for new), or plan to use, with clear financial projections for how (for proposed), closed-loop cooling systems, and I'll consider conceding this point. Until and unless someone can do that, you can point to the option of such systems until you're blue in the face, but it's meaningless.
But that's more expensive to operate.
So most of them don't do it.
Show me actual statistics that a supermajority of new and proposed datacenters either are currently using (for new), or plan to use, with clear financial projections for how (for proposed), closed-loop cooling systems, and I'll consider conceding this point. Until and unless someone can do that, you can point to the option of such systems until you're blue in the face, but it's meaningless.