With the whole 'built-in Plex' thing that LG TVs had, I was actually pretty interested in getting one. After seeing them in action, I've realized that these people obviously don't test their software in any real circumstances.

Companies building 'smart' devices need to ensure that the core interactions people are going to have with their devices are as good as or better than the alternatives.

What LG could easily have done is built a small, always-on device core which defaulted to a splash screen containing inputs on the left and favorites on the right. Powering on the TV would be just warming up the LCD display, a few seconds at most. If your current input is inactive, show the splash screen. Otherwise, go straight to your content.