On some Samsung TVs I have used, and least one model of either TCL or Visio non-smart menu functions are slow and clumsy. Input switching on one "smart" TV in particular (I'm pretty sure it was a Visio) was like a four step process instead of a simple button press. It was really eye opening just how bad designers could screw up something that should literally be a one button press. You can't assume anything with new electronics - some of the UI designs are stupendously horrible.