Been following this and related RTX threads for a while, but felt compelled to register and post.
I fully agree that RT does look great, but I would be keen to highlight the fact that not all maps in BFV will have this sort of setup. The scene shown in the demo is effectively a hall of mirrors; it has a convientently wet, reflective floor surface, buildings full of windows which represent the walls, and one non-reflective sky being the ceiling. So immediately you have 3/4ths of the scene functioning as mirrors, coupled with various stand-alone 'mirrors' (car panels, soldier's eyeball/gun/bayonet). That's quite fortunate for RT purposes!
Whilst it looks fantastic, what are the other BFV maps going to be? I'm sure some open land maps will be there with few walls to be reflective and few puddles of water (it isn't always raining!). Chances are there will only a small amount of maps (and a small number of areas within said maps) that lend themselves to this hall of mirrors effect. Furthermore, your not always going to be on foot in BFV, and I imagine RT it hard to appreciate when traveling fast in a plane or light vehicle.
This isn't me trying to diss RT, but I think it's important to balance this demo's impressiveness with consideration of what it will be like in other scenes within the game.