You must be young. Every single gfx technology that came before this took years till developers learned how to use it properly, RTX/DXR is no different. Also, no game supports all effects in DX12 or DX11 or DX10, so I don't see how supporting everything DXR can do is relevant.
And again, this is not a discussion to have in a thread about RTX being sort of supported on Pascal cards.
It is relevant.
This "RTX being sort of supported on Pascal cards" move has one purpose only : Try to convince ppl to "upgrade / side-grade" to RTX cards.
Then, what is the point to do this "upgrade / side-grade" when there are not even a handful of Ray-Tracing games out there ?
RTX based on DXR which is just one part of the DX12 API, RTX itself is not comparable to fully featured DX10 / DX11 / DX12 .
Compare it to Nvidia's last hardware-accelerated marketing gimmick a.k.a PhysX, tho.
It was the same thing again, hardware PhysX got 4 games back in 2008 and 7 in 2009, then hardware PhysX simply fade out and now open sourced.
Now we got 3 Ray Traced games in 7 months, sounds familiar ?