Dual fan is found on the 13" MacBook pro with a touch bar becuase the TDP on the CPU is much higher. (28W). It's also in the 15" MacBook Pro with an 80W TDP, and bigger heat pipes.
Finally, It's a bit sad that you guys didn't compare this year's heat sinks to last years. Do some flow rate testing on the fans, and give us dimensions and weight of the heat sinks from last year to this year. Without making any proper measurements, you cannot make *any* claims about the thermal system being "advanced" or not.