Reminds me of a show we went to on Broadway – this device is so common in the USA, where you get real time captions. Your eyes are away from the action
Personally I am not that keen of captions on a tablet to make a play accessible. It’s not great equality as you are either reading the captions from the tablet of watching the actors. Think you would miss much. What I like about open captions is I can just sit down without having to collect a device and at the end having to drop it back.