It appears that Netflix is on the cutting edge of descriptive audio. I think most of the Netflix originals have it. My girlfriend (blind) and I (sighted) enjoyed Stranger Things and Bright and Seven Seconds with descriptive audio. She loved it. And I stopped noticing it until it was off and I had to focus more to keep up.

Still some work to do with the various user interfaces. Apple TV has the best voiceover (settings > general > voiceover)... [our Apple TV may not be the latest gen]. But it is more effort to find the descriptive audio once you're in Netflix via Apple TV -- you have to set it to descriptive audio every episode or movie.

I came with Google Chromecast. No voiceover as far as I know. But Netflix via Chromecast has a genre for Descriptive Audio (which is not found via Apple TV). It saves us the trial-and-error experience of finding descriptive audio. Also, Netflix via Chromecast saves our last descriptive audio settings, so no need to pause and navigate thru to turn it on every episode or movie.

Neither apple or Google is perfect for it. Netflix is definitely standing out. E.g. just discovered that the latest season of Trailer Park Boys has descriptive audio. (... we'll see if she likes it... I hope so; we live in Nova Scotia!) It really is the many little things, which aren't actually little at all. Busses that automatically annouce the stop. Elevators that say the floor. Braille on business cards and official government documents and cards. Tactile paving. Apple TV's voiceover. Neflix's descriptive audio. I barely used to notice these things but now I do. And how much they're appreciated by those they help.