Please make a Language Reactor app (Google, Apple) that uses Youtube videos. It can be done as FluentU, Yabla, and LingoPie does it. I don’t think you would be allowed to put the Netflix videos in the app without a licensing agreement (sigh).
An app is needed because many people use tablets and phones instead of being tied down to a computer, so an app would be awesome even if you only had Youtube videos in it.