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
People that roll their eyes when you correct them in stating captions and subtitles are NOT the same thing have clearly never worked with captioning. However, I'd much rather work with them as SCCs over the old way of using a CAP file and hardware encoder connected to a PC. Unfond memories of inserting captioning to to the same tape using pre-read where it reads from the tape, sends the signal to be captioned, and then records the data back to the same tape. In real time.