I want to add my voice to how important fixing this limitation is. Right now, on a Pi 4, depending on whether DRM PRIME is enabled or not, you can choose to be able to play interlaced video (which includes most live TV), or 4K video (which cannot be decoded in software on a Pi 4 in real time).
This is a huge regression from LibreELEC 9, which can do either without having to change a system setting in-between.