I didn't figure out you could use the Apple TV remote to control the TV's volume until almost a year after we first got one. It's a great feature, but with kids, it's just a shame the remote feels too fragile to use when they're around.
Quite a few of the features I need to try out myself, but I think the biggest barrier to discovering them naturally has been the remotes we use. We have an all-in-one remote and I use the iPhone app from time to time which, despite 3D touch, doesn't match the physical remote feature for feature.
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