So that's a 4090 being unable to render natively at 4K at any more than 35-38fps, and you're saying 70+ with DLSS quality (66.6% render scale). My linked timestamp is the mid-30fps experience at native 4K.
This is a thread about a non-XT 9070, something AMD claim will match a 4070S, give or take. If the 4090 can't do it without upscaling, then something in the 4070's ballpark has no hope.
Here's the same guy running path-tracing on a 4070. He doesn't even bother trying to do full path tracing beyond 1080p because it's a 30fps experience. DLSS at 1080p means that you're upscaling from 720p which makes image quality absolutely abysmal, and that's why he gives up with full path tracing at that point.
I'm not trying to make the point that path tracing is utterly impossible, just that you need extremely high-end hardware to even have a chance, and even then you're giving up a far better framerate at much sharper image quality and much better input latency in order to do so
For the purposes of sub-$1000 GPUs in 2025, it's going to be hybrid RT rendering for sure.