I think this is just wrong. I don’t want “the same bitrate as ProRes”, I just want higher bitrate HEVC. For example YouTube has recently added a “high bitrate 1080p” option, which is still 1080p but less compressed and therefore better quality.
Sounds like scope creep not targeted at their intended audience.
Likewise what would be the difference between adding a 45mbps ProRes option vs adding a 45mbps hevc option? That fact it is hevc? They would take up the same storage space.