Imagine that every time you play some video file, all the lower thirds and announcements remain as the part of the file.
And you have to make a copy of that file for different programs, so you have the clean version for the next use.
This was all in the past, because in our News Room, thanks to the various graphic tools, you can add and edit stories lower thirds or any other titles, inscriptions, etc. Change the text, font, colour and style for every program and still have a video
as a clean asset for some future uses.