This is why no TV in my house ever gets access to the wifi. If I must update it, it gets a temporary guest network.
Without updates you might miss out on other improvements like decreased input lag, support for another format, and bugfixes for the existing implementations (i.e. the HDMI decoder strobes when specific configuration X is utilized).
As a concrete example, Sony added HDR to one of their lines a year after it's original production a few years ago[1].
[1]https://www.sony.com/electronics/support/articles/00157695