Then my iPhone pops up a "Keyboard Input" notification with a text input that I can type from the phone without unlocking it.
Of course, if you don't have your phone nearby it might suck but let's be realistic, how often you don't have your phone close by when watching TV?
P.S.: Yes, I know, if you are an Android user there is no way out and Apple sucks for that, not defending them at all.