Not to rival you on this, Seeing that AMD is slowly amputating itself from GloFo, and all their comingling as to wafer agreements I think this was what AMD could do. It was all GloFo could provide within that without a lot of engineering funds/time from AMD. I think this was all AMD had as a "course/finale" at GloFo. AMD kind of took it for many reasons we don't always comprehend. This probably was the best way to stay in their agreement, till they can finish the 7nm Navi, and offer some last thrust.
I just wonder if AMD is being press by GloFo to change all their production to 12nm, ceding GloFo to settle into a concurrence in production. If that's the direction GloFo press's what will the RX580/570 end up being? Just 12nm at the same clock just lower power, and improve OC'n?
Honestly this is working for AMD as Nvidia has to toil with reducing their channel inventory but maintain their current pricing. They can't bring anything new to the market while their abundance of Pasqual remains.