I am reading these posts and to he honest, they've left me baffled. Why is a lack of updates for a TV a problem? Why would anyone even want updates? A TV set is a device to watch a TV transmission. As long as it fulfils that purpose out of the shop, it will fulfill that 2, 5 or 30 years later, just like your grandma's set with vacuum valves (tubes). Unless the TV transmission format changes, e.g. from analogue to digital, but then your grandma's set would also have the same problem.

Regarding playing the sound through the speakers and headphones simultaneously, I can think of a use case right away. And old, half-deaf family member puts on the headphones and listens on full blast while the rest of the family listen through the speakers. To be honest, I have not listened to the TV through the headphones for years and I do not even know if my current set even has the capability, but one of my previous sets had the simultaneous playback and another, 15 years older one, had two jacks: one would disconnect the speaker and the other one would not.