Here's an illustrative quote:

"By now everyone should have managed to get their head around the fundamental inefficiency of turning electricity into hydrogen, compressing it, storing it, moving it around and then converting it back into power on board a vehicle. Somewhere between half and three quarters of the input power is wasted, and this is not going to change much - there are fundamental thermodynamic constraints. Not only that, but the H2FC vehicles are also much more complicated so they have higher maintenance costs, and although hydrogen can be safely handled, you really don't want it in every garage and workshop. You can forget use cases like urban delivery, two and three wheelers, metro trains and buses."

[0] https://www.linkedin.com/pulse/clean-hydrogen-ladder-v40-mic...

Equipment to handle fluid at atmospheric pressure is very different from that which handles high pressure gas/fluid.

You'd have to replace the underground tanks, all of the associate plumbing, and the pumps on the surface. That's going to cost just as much as building the gas station in the first place.

That's assuming you're trucking in liquid hydrogen. If you want to put it in underground pipes, you're going to have an even worse time. You need heavily insulated pipes running at extreme pressures. Those pipes also need special coatings to prevent the hydrogen atoms from leaking out.

This is far from a simple case of "just reuse gas stations". Hydrogen presents an order of magnitude more problems than gasoline. Gasoline's main benefit is that it's pretty stable at room temperature and atmospheric pressure. It's easy to handle and store, and vanishes into the air at a much slower rate.