It’s interesting how recent the permanent overlay actually is. During lockdown when only classic games were on tv you got to see a lot of different presentation styles. I believe it wasn’t until 1998 CBS had one for college basketball for the entire game. That’s the main one I can remember, but I’m sure most other stations were right around that time for other sports as well.
The tech was there for a long time obviously, because they would flash it on the screen and be able to embed the clock. In fact in CBS’ case I think it was the exact same graphic.
Nowadays there’s almost too much info on the screen, especially for football. The scorebug will have all the info, then there will be like three graphics superimposed on the field with the same down/distance, play clock, and especially NBC likes to shade the field between the line of scrimmage and first down.