Yes the old GCN is still rock solid(I was using a 7950 for awhile). Issue is RDNA, lots of bugs still. Granted much better than even a year ago, but still not mature. For instance with my 5700XT, after game or other load, some setting screens (Windows or primocache) will be all white an no way to interact with, can't return functionality outside of rebooting. Other noticeable graphical glitches(mouse Point corruption, photo showing corruption and other horizontal line glitches). All my issues are resolved by rebooting exception issues with audio through HDMI output of the card... I gave up on that.
Maybe there is a good case to show AMD does better with legacy GPU support than Nvidia(which you are left high and dry). From my experience though Nvidia's current cards (up to 6 years old) work as you expect without any issues.