Bring back the referece monitor (or fix Mercury Transmit issues)

Probably an unpopular opinion but I'm missing the reference monitor as it would be a workaround for the ongoing problems with Mercury Transmit (see: https://community.adobe.com/t5/premiere-pro-discussions/mercury-transmit-issues-3-monitor-setup/m-p/10961086).

The reference monitor or a second program monitor would help in that case as they are independent from display resolution or scaling. They are just a panel like every other that I could drag and drop wherever I like (also in a corner if the third monitor is for someone else who needs to have a script open).

This is setup independence I'd like to have back. If not in the shape of a reference monitor, then with the possibility of opening a second program monitor (panel).

An option in such a panel to lock the monitor to be only program or (auto) switchable between source and program would also be helpful.

Mercury transmit is nice IF it works and if you want the image to be full screen. In other cases, the "update" of removing the reference monitor really just was a downgrade from my point of view.