Since the FP2 is a WiFi device that doesn’t go through an Aqara hub, I imagine it would need its own binding to connect directly to openHAB, rather than extending the existing one.
I assume you’re talking about the FP2 gaining Matter support. That won’t change anything about directly connecting to openHAB, unless/until we have Matter support.
The problem is that Matter isn’t coming together the way it was pitched, because companies are resisting the original “everything just works with everything else” concept. Until there’s more clarity on that, I would hesitate to buy anything that depends on Matter.
I really like the capabilities of the FP2, but for now I’ll stick with my much cheaper Sonoffs, which are working very well for me.