… support legacy OS users.
At this time, all models Apple TV from the 2015 model 4th generation and later, support the latest OS version. About Apple TV 4K and Apple TV HD software updates - Apple Support. There is no reason to stay behind. Despite the incidental claims of users with issues, reverting would not be a solution. Fixes will come with later updates. Retired functions will soon be broken on older OSs, when Apple ‘unplugs’ the server that handled that. There are very good reasons to stay up-to-date: features, security updates, bug fixes. The only way is forward, and that’s a good thing.
As a developer …
That surprises me. Developers should want users to stay up-to-date on software versions, and know why that is important. When an app developer gets asked by a user why something doesn’t work, they’d also reply: “Well, have you updated to our latest version? Do that first.”
Remember when Netflix started requiring tvOS 16.1 or later, almost a year ago? Almost everyone still on prior version, updated then. Their older tvOS app versions didn’t connect anymore, apparently a server-side check for some compatibility. I think Apple was happy how that turned out, with getting users to do the updating. Lesser apps may not have that influence, but up-to-date users wouldn’t have noticed anything about it.