The Apple TV wouldn’t benefit from any further 802.11 upgrades. WiFi 6 is already too fast for what the device is for… streaming. Media streaming averages are 5-15Mbps for your typical apps (Netflix, Hulu, etc). TV+ streams higher than all other providers… around 25-35Mbps. That being said, the Ookla Speedtest app on my Apple TV shows I get nearly 500Mbps over WiFi. So I literally always have a minimum of 400Mbps to spare… upgrading to WiFi 6e, 7, or hell, 10 will yield absolutely no performance benefits for a streaming device.
For anyone who does experience buffering on their Apple TV… buy a decent router and don’t set it up in the closet on the opposite side of the house.
I have a DS418 with 40TB, I don’t have a massive collection, but it’s respectable (350 movies, 7000 tv episodes). I have never once lost my metadata in the 5 years with this setup. I did have a hiccup when I migrated my collection to a new drive, but Infuse loads everything back quickly. Just make sure you name your files properly (e.g. “movie.title.2023.mkv” and “tv.show.S01E01.mp4”) to save yourself from the headache of incorrect metadata.