Had to make an account just to comment.
I think many people here would be very surprised at how common these are still.
In my work, we get SCC ordered CONSTANTLY, even when the intended platform it’s for is fully digital.
I feel it’s a mixture of misunderstandings between that and SDH in addition to just people using subtitles and captions interchangeably.
Just because it's fully digital means what to you?
To the viewer relying on captioning, it makes no difference whatsoever. Captioning is decoded by the TV itself. Subtitles are overlaid by the app. Streaming sources when decoded send the embedded captioning to the same caption decoder as OTA broadcasts or decoded from a VHS tape.
From someone that has spent decades working with subs and captions, the differences are obvious. To everyone else, it's just text on screen regardless of what it is technically