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Other mesh networks such as Eero and soon Luma support hard wiring your sattelites. I think its extremely important Netgear Orbi does the same. Especially for those of us who can.
Please make a new post here and lets trouble shoot this.
https://community.netgear.com/t5/Orbi-Pro-WiFi-for-Small-Business/bd-p/en-business-pro-wifi
Ethernet backhaul has been supported since the SX series first came out. I know my SXK30 series works.
Disable of wifi BH can't be supported as the BH needs to be enabled all the time is case the wired back haul fails, the system has something to fall back on. Not needed as well. BH support is automatic, and doesn't need any forcing.