10GbE on the LAN side is quite useful, though companies that provide it, really need to provide at least 2 10GbE ports on the LAN side. For example, I like having 10GbE for my NAS build, as well as my main gaming PC, and then leaving the other wired devices on 2.5GbE
Beyond that, 5GbE would also be good since with 2.5GbE if you do a wired backhaul between the satellite units, then the 2.5GbE becomes a bottleneck since the MLO backhaul the newer Orbi devices, can easily saturate 2 2.5GbE devices at once under good conditions.
The Orbi 970 allows for a better wired backhaul, though it does not have enough 2.5GbE ports for a sufficient number of devices. Ideally they should have at least given the Orbi 970 satellite units 1 10GbE port, 2 2.5GbE ports, and 4 1GbE ports. My reasoning for this is more for wired IOT devices that users may want to locate in different areas. For example, Many IOT hub devices use a wired connection (e.g., the Arlo smart hub), and users may want more flexibility in the locations of devices like that.