Google's Chromecast - a super idea but which was both misunderstood and fundamentally flawed

From 2013 until, arguably, today (2025), Google had a solution for every home without a fancy Internet-connected TV. So that's most people. The idea was that you could 'cast' a video streaming app from your smartphone - Netflix, YouTube, BBC iPlayer, Prime Video, and so on, and Google's Chromecast gadget, plugged into an HDMI port on your otherwise 'dumb' TV, would handle the content and let you watch things on your much larger screen. On the face of it, users would think that it was their phone's app directly streaming the video content to the TV, and it's here that the misunderstanding occurred. You see, Chromecast was in fact a tiny Internet-connected and media-savvy computer in its own right and all the user phone/app was doing was passing a specific playback/streaming URL to the Chromecast, for it to handle playback from then on. So the user could then do other things on the phone, or even wander off for a walk and leave someone else watching, eve...