Wired backhaul worth it for an AX6000 system?

I'm getting about 680-720/41.2-41.6 mbps through a LAN cable from my office satallite to my iMac 5K, but about 941/39.5 directly out of the main router (now that Speedtest is working again).

The office iMac to the Synology downstairs is a pretty consistent 60-66 MB/sec which ethernet should improve to a little less than a gigabyte.

If you use ethernet backhaul, does the Orbi free up the backhaul radios for other devices?

I'm thinking of putting a 2 10gb / 8 1gb unmanaged switch in the utility room with a 10 gb and 1 gb going to the Synology and Orbi router in the family room, a 10 gb and 1gb going up to my office for the iMac and Orbi satellite, a 1gb going up to my wife's office, and 1 gb going up to the living room for the Living Room satellite. That'll get spread by switch to the various living room devices and daisy chained to the dining room where my wife has a computer and we have another iMac 5K. The Living Room to Dining Room feed will have to go up in the attic with drops down two walls, an interior and an exterior.

Can you run the backhaul through a switch, or does each router <-> satellite connection require it's own (topologically speaking) wire? If that's the case, that would mean two additional 1 gb runs from the router to each of the satellites in the Living Room and Office.