Geothermal power still uses steam to generate electricity. It’s steams all the way down.
Same for all the others like coal and nuclear though. So that’s a dumb distinction to try to make.
Steam is always just a transfer mechanism if it’s part of the power generation
Then why focus on steam specifically, why not other required intermediaries, like turbines, the storage mechanism.
The main meaningful distinction in energy generation is the root sources of the energy, nuclear, wind, hydro, etc. All of those share similar conversion methods and intermediary forms, but have different sources.