Path tracing a really complex static scene in realtime has become quite feasible recently, especially with all these fancy temporal denoising filters that basic

Path tracing a really complex static scene in realtime has become quite feasible recently, especially with all these fancy temporal denoising filters that basically turn purse noise into surprisingly high quality images in no time. The catch is the word "static". Dynamic scenes suffer from the overhead of building acceleration structures. You can hack something together if you have a tiny bit of dynamic geometry in an otherwise static scene or your animation is just moving static objects around. But a raytraced animated human face in realtime is something that we likely won't see for a while still.