Long-time ATV user, and have just upgraded my TV to a new Samsung, so grabbed an ATV 4k.
A lot's changed in 10 years. Samsung is now full of apps - covering pretty much everything I use ATV for - Apple TV+, Plex, BBC, Netflix, C4. BBC Iplayer also supports UHD on Samsung, but not ATV :(
TV also supports Airplay. To be honest, I'm now questioning what I need ATV for. I don't use Siri, and things like fitness+ I can mirror from my iPad.
What killer apps am I missing out on? Can you convince me not to regret my new ATV?
(edit - I'm in the UK, although prob obvious :)