Why aren't there any shower combinations with rain showerheads included?

Kingston Brass does offer a wall mount shower system that does include the raindrop showerhead.
To reference these models, please reference https://www.kingstonbrass.com/?s=rain+drop+shower+system&post_type=product

If you would like assistance building a custom shower combination, our technical experts are available to assist via email at [e-mail].