The main reason to keep hydrocarbon fuels in a green-energy future is for their energy density. Rockets and airplanes will always want the best density and weight available, and that’s hydrocarbon fuel for now, barring some order-of-magnitude battery improvements. Hydrogen rockets are a thing, but their tanks are huge compared to methane or kerosene rockets.
Same as Green Hydrogen, you'd only burn these if you couldn't directly electrify or battery power it.
Otherwise you're using electricity you could have used directly, to make the fuel at a big loss of efficiency.