@lalitk
Can’t take any credit on the amplifier focus at onset as I heard it mentioned originally by Mike Moffat or Schiit Audio. He emphasized some years ago that the DAC craze was out of hand and the changes between varied ones was not that large and more significant gains would be found by focusing on amplification.
Think about it. A guy who at that time was in the DAC business pointing in another direction entirely: amplification. What a legend.
As for the copper ethernet vs. fiber discussion, I’ve made connections and seen how that goes with varied system iterations. Have seen copper beat fiber and vice versa. Think a router from a service like Verizon with fiber-optic internet is easily superior to other offerings and so if that’s available, an entire system review is warranted.