You provide zero supporting arguments for your point. Megawatt electrolyzers exist today. They existed ten years ago. They don't use anything in large quantities of which supply is limited. You give no reason why we can't just build more of them.
A megawatt is basically nothing. Average load for electricity in the US is 500 GW. How much did that megawatt electrolyzed cost? Does it also include the cost of converting that hydrogen back into electricity? And remember this cost is on top of the cost of generating the stored energy in the first place.
But is it cheaper to build more electeolysis storage, and lots of overproduction in renewables? Well, until someone actually offers hydrogen storage commerically, there's no price. If it were cheap, we wouldn't be using steam reformation.
Oh good grief. Titanium ore is literally dirt cheap. Titanium has been pricey because of how it's made from the ore, not because the ore is scarce. Titanium is the 9th most abundant element in the Earth's crust.
The fact that it's scarce because it's so difficult and expensive to perform the chemical processes to isolate titanium doesn't chance the fact that it's scarce. Unless you have some novel way to drive down the cost titanium, building huge public projects using large amounts of titanium will remain infeasible.
