That's why I went with Roku TV. They are the only platform with a consistent track record of supporting old hardware. You also don't suffer from the single vendor lock-in of Tizen or WebOS or the wild west of Android.
if you are going to get a smart TV, definitely get a Roku TV. While the interface for controlling the settings is much better than any other TV, the remote app is nice and the private listening is awesome, the hardware is slower than AppleTV 4K, and it doesn't handle fast forward and rewind as well. The right half of the home screen is used for ads and the remote buttons for quickly going to other channels isn't customizable and you are stuck with whatever provider paid Roku for placement.
We have two Roku TVs and two other TVs with Roku sticks. We also have AppleTvs connected to each of the TVs - one 4K ATV and the rest 3rd Gen ATVs.
The ads are obnoxious and the way every "app"/service implements their own interface with quirky behavior (Does the "up" button show the timeline, pause, or take you back out to the episode/series selection screen?) is annoying.
Fortunately it's possible to fix the ads at least by blocking doubleclick and the roku ad/tracking domain at the router level. Doing this leaves a blank "empty poster" graphic instead of an ad, but doesn't seem to break anything else. Updates, search, and content all continue to work fine.
