I bought an Nvidia Shield because the Plex client can switch the display's refresh rate to match the content (no judder for 24p content). Based on [1], it sounds like that should be possible with the Apple TV, too. Can anyone confirm if this works well?
I can't confirm with Plex specifically, but I can tell you content matching is an OS-level feature, not specific to apps. It works for the apps I've tried.
[1] https://support.apple.com/en-us/HT208288