Exactly, that is usually the reason, because with radio control the roller shutter/window builder can simply make more money... and from this approach you can also see that it is not about your needs and you were actually advised incorrectly...
My window builder tried the same and painted the Somfy system in an overly positive light and spoke badly about Rademacher, etc. well, and three years later I still have more options with my motors than Somfy
Just get independent advice...