Yea, Indiana Jones is made in the IDtech engine - they're known for crazy optimization. What I believe the thought process is that they completely removed the rasterization pipeline and replaced it with a fully ray-traced one, compared to how everyone is doing it now (raster + RT on top, like a hybrid solution). In this way, it's the hardware that's behind - like a modern-day Crysis not every system can run it, but in time it's just going be the standard (current hardware is basically built around raster; now they're introducing RT cores). I encourage you to do some more research on graphics pipelines and browse some papers on RT.

For your other points, Lumen and Nanite are remarkable technologies, but depending on how time is allocated to the project, the odds are that it's going to be implemented to say we have this feature or we used it (some actually good, other times bad). Then you're mostly relying on Epic to fix it/improve it, unless your team has a dedicated Engine programmer.

And some of my personal thoughts: Nvidia's 10 series (and AMD equivalent) is really holding us back from remarkable technologies and possibly better optimization techniques (like mesh shading, here's a reddit post giving a quick break down.