I brought this to @'s attention, he mentioned that glossy reflection quality is a priority for them to fix. There are Cvars that let you raise/lower the roughness value of surfaces for lumen to trace better with, but that could mean a lot of art direction changes with legacy content.
I know they scrapped cone tracing for pipeline consistency/ technical issues, but I’m wondering if they’d consider bringing it back for SWRT. From all the lit. I’ve read, cone tracing can integrate varying roughnesses extremely well, and even the light leaking/over occlusion seems less distracting than the temporally-unstable fizzle.