Google getting its AI-driven Assistant technology into Sony’s Android TV sets is one of the easiest decisions the search giant has ever had to make – a move that could spearhead the beginning of a significant fightback against Amazon Alexa in the smart home battle. It is unclear to what extent users will be able to use Amazon’s Echo smart speaker (also driven by an AI application, Alexa) with the Sony Android TVs, now that Google Assistant is integrated. The fact that the touchscreen Echo does not allow YouTube videos to be played suggests Google and Amazon would rather butt horns, but consumer pressure may make that impossible. Despite devices from Google, Amazon and more providing access to third party…