If you're using it as a dumb TV, unless it shipped some critical firmware issue that prevents core functions from working (like HDMI input, switching inputs, etc) there shouldn't ever be a reason to update it out of the box.
I've used smart TV's for 10+ years now and figured this out of the awful experience from the first one. Never had any issues with the ones I've never connected to the Internet.
Punchline goes in the description.