It does have 8x 10GbE ports and one of those can service as much traffic as the device can process.
I'd think they are more there for choice and HA setup. i.e. you'd use maybe 4-6 of the LAN ports, 2 for the LAN and pairs for DMZs. If the rest of your infrastructure uses SFP+, use those; SFP, use those; RJ-45, use that bank of ports