The 2000 series will be entering planned obsolescence now the 3000 series are available.
Very true yet unfortunate for those who didn't plan on upgrading with that hardware.
If you look at the chart from TPU, from the post you replied to earlier, it uses an Intel Testbed using a 9900k. The difference between a 3070 and 5700xt is about 10 FPS. However, the results of Guru3d, which using a AMD testbed, shows that gap narrowing in Valhalla 5 FPS. Now it's not an absolute. However, it does show that, to me, using an AMD build with a Radeon GPU can improve performance.
I also found a video using a 5600x showing, at times, better then 60 fps.
1440p start at 1:30 mark. And this is with a 5700xt. We all know it's not a high end card. But can get you roughly 60 fps at 2K (ultra w/med. aa) from an engine that is notoriously referred as a "bad port" is no slouch IMO.
It does appear that even with the 5700xt (and higher: RDNA 2) using Zen 3 should be advantageous when looking to eek out that little bit more in performance in games. Without having to worry about fine tuning your PC for OC'ing, allegedly.
I do have a even handed expectation of the overall performance of the 6800xt. Be it that it can OC to 2500Mhz is still a rumor right now, IMO. Based on this insight the 6800xt 'should' do exceptionally well for this game.