Gotta love the modding. I must say that after the setting that CDP enabled by default (2x2), mostly everything over that setting looks like diminished returns.
with bounces yes, but a higher ray count per pixel does help with noise and speed.
one issue RT lighting still has is fast changes to the lighting, be it due to a moving object or a sudden change like turning lights on and off,
both of those issues are happening due to the low ray count games still have to use due to the hardware limitations of today.
the denoising and accumulation needs to work overtime with stuff like this currently.
if you increase the rays shot out per pixel to 4x or 8x, these issues should be way less prominent.
eventually when cards can handle maybe 16x or 32x, you definitely want to have the ability to go back and use that hardware power if possible.
this is why IMO developers should include options like that going forward.
due to how seamlessly scalable raytracing is, they should take advantage of that by making their games future proof.
not only that, the amount of rays being shot into the scene scales with output resolutions, so if you use your 4090 on a 1440p display, you will need to resort to supersampling currently to get as clean of an image as you would get if you ran the game on a 4k display, which isn't optimal imo.