No argument that 50-62.5 kW FCs are inadequate for extended road trips. Perhaps you've forgotten that the first 150 & 350 FCs were installed by EVgo in Baker, CA on I-15 to serve the LA - Vegas traffic, so it's not as if no one but EA has done or can do this:
https://www.evgo.com/press-release/...per-fast-ultra-fast-chargers-open-ev-drivers/
States e.g. CO & MT have been spending settlement money on establishing charging networks both on interstates and U.S. highways, admittedly mostly lower power and in Montana's case just a single FC per site, which is totally inadequate for reliability never mind potential extended wait-times, but there's nothing to preclude states or the feds from requiring more powerful and more numerous FCs per site as a condition of receiving money.
As the energy majors and other auto manufacturers increasingly move into charging (e.g. Shell owns Greenlots here; BP, Total etc. own some European networks while BMW/Daimler/Ford/Hyundai/VW own the high power, widespread Ionity network) we'll see more private money being invested, especially as more and more of manufacturers sales and profits will depend on PEVs.