Like what? Display Stream Compression is entirely broken. It worked in Catalina.

In Catalina my Mac Pro with a W5700X happily drove 2 4K monitors in HDR10 at 165Hz.

In Big Sur my options are now SDR at 95Hz or HDR10 at 60Hz.

This has been broken since the 11.0 betas. This happens with multiple GPUs, multiple monitors, multiple interface types.