I've been loving the new 2021 model of the Siri remote. I understand the dedicated up/down buttons are mapped to bringing up the video controls and pulling down the info/options pane, respectively, and these are good intuitive actions for the default controls.
That being said, both of those actions are easily done with swipes on the touchpad since the previous Siri remote had no up/down clicks. I'd love an advanced option to use those up/down buttons for channel surfing while viewing live TV. This would eliminate the biggest benefit of third-party remotes for me.