I have a Fire Stick and a newer Vizio TV. For a while I could tell Alexa to turn in the TV: the Fire Stick would turn on, then use HDMI-CEC to turn on the TV and select its input. Worked great and I didn’t have to deal with Vizio
Then at some point Alexa started controlling the TV itself instead. Now I have to choose whether to deal with Vizio or to do more clicks to get to my streaming device. I really need to figure out how to get the original configuration back