Same issue here as @dpotuznik , lumen doesn’t hit the quality required yet for rendering videos. I can’t share my repos because it’s 50+ Gb unless you dm me.
I’m also using RT reflections in a game (thankfully still 5.3) and I couldn’t get lumen reflections to render as sharp (reflections are vital to my gameplay).
Phasing out Raytracing in 5.4 is a rushed decision I think – until there’s an easy checkbox in the PPV to get the same quality as RTReflections with Lumen Reflections, I still need RTReflections.