Maybe they’ll use DirectInput for FFB on the PC version only, otherwise I believe this is one way to see this.
However there are other equally valid ways to see this too:
About the Xbox version, their goal is to make it virtually indistinguishable from the PC version, and right now it looks good but more work is needed. Jörg specifically talked about native controller support, but some companies are already announcing Xbox peripherals specifically for flight simulation and they are very excited about that. In the end he expects that the experience for the hardcore simmer will be very similar to that of the PC version.
https://www.avsim.com/forums/topic/597920-jörg-neumann-regarding-reception-data-xbox-and-add-ons/
Unrelated to the topic, but to your remarks, they certainly know better what and what not implementing in the game after all, and it is not just about customer wishes or bugs reports:
Discussion: March 25th, 2021 Development Update - #331 by Jummivana