Aside from lots of people still holding onto RX 580s or 590s because those can still apparently run a lot of stuff at passable quality settings, let alone the Vega 56 and 64 and even the RX 5700 and 5700 XT still being really capable on their own, and yeah, RT emulation on pre-RX 6000 cards is a Linux-exclusive feature and hasn't been implemented in Windows yet and I don't know if it ever will be.
Even GCN2 cards like the R9 390 or 390X can still hold their own once you get around the Vulkan 1.2.170 limitation, which can be easily accommodated for by using DXVK 1.10.x, as long as you're fine with the higher power draw vs. the RX 580 or 590 assuming everything is stock and you didn't undervolt them or set an artificial power cap in Corectrl, plus the RX 580 and 590 support Vulkan 1.3 and thus can run the latest version of DXVK.