A streaming box can be factory reset or thrown in the trash. If your 65 inch TV doesn't let you roll back an update you have to buy a new TV. Streaming boxes are usually faster and more feature filled than the in built TV stuff as well.
Without connecting my TV to the Internet for firmware upgrades, I would be missing out on several fixes and improvements especially with handling of higher frame rates, VRR and IIRC at least one in the HDMI ARC subsystem that was causing audio drops.
Interesting! I haven’t connected my smart LG to the net since it was new, and it handles everything I throw at it.
I prefer to use an external box as opposed to the built-in apps, to have a more responsive interface, to keep the TV as clean as possible, and to have control over choosing to update the TV or not.
I imagine all of them. This is all controlled in soft/firmware and as such is bound to have bugs. There's also updates that make better use of the hardware.
That's exactly the problem. There's no guarantee that the built-in will be and remain "proper" with updates. It's like saying we can trust our government with encryption backdoors as long as they behave properly.