So currently (excuse the terrible schematic graphics) this is what I have:

FIOS Router -----[WIRED via Ethernet] ----> Netgear Orbi Mesh --------->
Apple TV box wifi'ed to Netgear Orbi
FIOS's new "cable box" wifi'ed to Netgear Orbi (or maybe wifi'ed to FIOS Router)
and
WAY TOO MANY Wifi Devices (phones, laptops, etc) to Netgear Orbi via Wifi
Nobody is unhappy with speed right now.
So, pretty much EVERYTHING goes via Wifi via the Orbi.
For sake of discussion, forget the WifI aspects of the FIOS Router


Now, someone who kinda knows (emphasis on "kinda") what they're talking about sometimes suggested the following:
FIOS Router -----[WIRED via Ethernet] ----> TP Link Ethernet 5-Port Ethernet Switch --------->
THEN from the switch
ethernet to
Netgear Orbi Mesh (still via Ethernet, just now with the TP Link in between)
Apple TV (now via Ethernet from a TPlink port)
FIOS's new "cable box" connected via Ethernet to Switch (alos a TP Link port)
all of which then goes to FIOS Router

And still TONS of wifi devices going to the Orbi.

I don't think I'm getting much of a benefit? Right? I mean, marginally, maybe the Apple TV (now via Ethernet) and FIOS's new "cable box" might get a small speed boost via Ethernet. But, at the end of the day, the Orbi is carrying the HUGE load of so many devices I've lost count.

Can't think of any reason I need to now "wire" the Apple TV or the FIOS box using ethernet and the TPLink? Right?

Can anyone give me a reason?