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