I will attribute this to Intel's advances and focus in low power processors, not much credit goes to Apple in my mind. The Macbook pro 2014 used Haswell proces

I will attribute this to Intel's advances and focus in low power processors, not much credit goes to Apple in my mind. The Macbook pro 2014 used Haswell processors which are notably more power hungry on idle than Broadwell and its successor Skylake, as Intel really focused on power draw with Broadwell.