IMO You have a wrong understanding of the capabilities of a smart tv. It is not meant to replace your laptop. Yes they do expect that consumers connect their laptop but not use the tv as a laptop. I am talking in general for any smart tv.
The capabilities you are expecting ; even an external box would fail to provide. The closest you can get is an apple tv or an nvidia shield, still they can’t replace a laptop’s capabilites.
Second to push the sales of the newer model they omit new features from older models and provide only on new ones.