Well maybe you don't discover them until a year later when you connected some new peripheral on a previously unused input to discover it's unusable but there's a fix for the known problem.

Is it really all that difficult to envision a legitimate need for bugfixes on a "smart tv" containing so much software? These things are as much a computer as they are a display. And modern software development practices have veered far into the direction of "ship yesterday, finish tomorrow with updates."