Are you saying 4k 60hz is fine, but 1440p 60hz is not? There is no reason that I can think of that would stop the Quake 2 RTX path tracing code being implemented in a next gen title, 1440p 60Hz, as an alternative option to legacy rasterization. Maybe this is why Nvidia are putting time in to it. The 20 series was a complete fail for RT. The 30 series delivered what the 20 series promised.
I don't play Fortnight myself, but I'm sure there are people out there playing with RTX on. Maybe even more than a handful. The 1st video I found, which has 435,263 views -
Personaly, I accept less FPS with RT due to it being far more demanding than legacy solutions, while providing a far more pleasing experience. I don't make a living out of competition gaming thus ~60 FPS at 1440p is fine. I'd even drop to 1080p for a path traced play through of Skyrim, though I'm sure it would be fine at 1440p due to how path tracing works.