It's a pretty clever way for Nintendo to get potentially several million mini-servers worldwide without paying a dime because consumers will be covering the cost.
If they're smart it could work like this
Regular Console NX = a little better than the PS4
Regular Console NX + SCD Device = on par with PS4K
People who want the highest end graphics can pay a premium for it, that's fair. Nintendo gets free servers. Win win all around.







