Let's start with some background information, so you'll get my point of view.
So I've been working on a content projection software, for lyrics, pictures, videos, pdf's, countdown and clock. Since it would be used on beamers, but also for livestream subtitles, I also implemented a greenscreen preset.
The other day I helped out on a big conference as end of director for the livestream. For the lower thirds for nameplates and stuff we used ProPresenter sending out TWO feeds. One with black/white and one with the actual content.