What about locating, mining, and transportation of the materials and precious metals used to make fuel cells?

Or the fact that making hydrogen is still a highly energy intensive process? It's wildly inefficient to take electricity, use it to make hydrogen, transport and/or store it, and then take the hydrogen and convert it back into electricity.

You will, of course, come back with the argument that future developments can and will reduce those costs and inefficiencies... while at the same time managing to ignore the fact that the same arguments also apply to future batteries and battery technology.