Only reason I can think of is that it will remove the routing / bandwidth used by the Apple TV and FIOS IPTV box from the Orbi, perhaps reduce latency a bit, particularly if the WiFi spectrum utilised is crowded.

It’s probably not much bandwidth, maybe 40 Mbps at most for the Apple TV, perhaps the same for the FIOS box?

If there are no issues seen on the network, I wouldn’t bother. Perhaps look to a WiFi 7 w/ 6Ghz bad support instead as the future upgrade.

But, why use a switch? Doesn’t the FIOS router / gateway come with 3-4 LAN ports?