We currently have an older 720p television and AppleTV 3. I'm thinking of purchasing a Vizio television that supports AirPlay 2. Some apps we already use are on Vizio TVs, but there are some streaming services we may want to try that are not, such as AppleTV+ or Disney+. I'd like to avoid springing for a new ATV4K, because the primary thing we use our ATV3 is for AirPlay. So here's my question: If I AirPlay, say, AppleTV+ from an iPhone to an AirPlay enabled Vizio TV, will the resolution and sound quality be downgraded? Can I watch 4K programming via AirPlay assuming the target device is 4K?