But TV's have minimal consumable highly interactive content and "state data" that a fullsized OS can load up, TV firmware offer mostly settings that depend on channel streams. And the smart TV's have the same downside as Android devices. Either outdated version, or needing reboots on n type of updates and all upgrades depending on the OS. I don't know which one's offer extended firmware/software maintenance service and for what price tag. While still needing reboots for that. Although I don't know much about Samsung's Tizen was it?
My refurbished Surface Pro 1st gen with SSD boots up pretty fast, almost as fast as the TV needs to "start up" before showing an image. The downside for the immense difference in possibilities out of the box, is at the cost of login, restarting everything loading up everything and reaaranging everything over virtual desktops and windows sizing for simultaneous consuming and writing or 2 different pages in the same book for cross-reference or reading the answer to the question on the other page, the unnecessary repeat is wasted time, that the tech can't yet prevent.
But the dream of convenience with minimal cost and interesting feasabilaty for the supplying tech (hw/sw components) companies and all involved, indeed that dream should remain in the view for the (aspiring) innovators. Never reaching infinity, but improving the status quo in the process.