Gaming is definitely a secondary reason to purchase any plug-and-play streaming device, but it’s still possible.
The AppleTV 4K, Chromecast with Google TV, and NVIDIA Shield TV all provide some aspect of gaming and, for many people, that’s a big plus.
Apple Arcade games are fantastic on the AppleTV but they are not a reason alone to spend 4x the price of the Roku Streaming Stick 4K.