Since (for reasons unknown to mankind) I can't reply to 7900 reviews thread anymore I'll just do it here.
I dunno why people are looking at 4090 or G80 examples when there was AMD's own very recent example of going from Navi 10 to Navi 21, on the same process no less, delivering more or less +100% of performance and a heap of additional features to boot. 4090 is neither the biggest gain over previous gen nor is it something special.
Navi 21 was not successor of Navi 10. Your comparison is totally skewed. Navi 21 was MUCH bigger and MUCH more expensive chip which had over TWICE the area and much more than twice the mfg cost.
Navi 22 was the successor of Navi 10.