What about Remote Controls
Some Smart TV's have a phone/tablet app to theoretically make control of the TV easier.
But when it comes to entering text on the screen you have to use the same mechanism as using the standard remote control. Entering a seach on Youtube is horrendous. Why can't the phone/tablet app allow you to use a pop-up menu.
Crazy. I reckon I could design better in a couple of days of effort.