Ooh, I forgot to mention VLC! Their Apple TV app is great -- if you've got a SMB file server, it can browse the server and play videos in basically any format.
I’ll also vote for Apple TV. It also acts as a hub for simple home automation if you just want a few light bulbs or something, or you want to store security camera footage directly to iCloud.
That requires iCloud, which is a privacy nightmare even if you opt in to their sometimes-kinda e2ee option (which nobody does). In the default config it is even worse.
