It says it runs worse when on for the 6000 series. So why would you want to turn it on?

Texture units are fixed function.

They are also a much bigger company with a bigger headcount. AMD doesnt have the budget to do what nvidia is doing. Nvidia is projecting to make more money next quarter than AMD will all of last year. If you only have a few people its in your best interest to look ahead not behind otherwise you will keep falling behind.

Its better to put the driver devs on new products instead. Its been 6+ years since polaris. You really got your moneys worth at $250 RX480 and RX470.