Accessibility isn't a single switch. A blind film-goer needs description; a Deaf film-goer who reads English may want captions; a Deaf film-goer who signs wants a fluent interpreter. Ship only one track and you've only opened the door part-way.
One screening, many needs
By delivering AD, CC and SL from the same app, synced to the same screening, a cinema can welcome every audience to the same showtime — no separate sessions, no compromise on which film or when.