A 5500 XT bought in June, so not old at all. I've heard the opposing argument, that since it's a relatively new card (out since Dec 2019?) I should expect some bugs, which is insane one year later. It's actually unusable, I have to log into my machine via SSH to restart it, or force reboot. It might break after 30 minutes or 3 days, when idle or busy.
AMD developers in that thread are chasing their tails and still haven't figured out why so many cards are having issues, and why other aren't, but as a consumer, that's really not inspiring at all.
Funny, I have 5600 XT (Sapphire Pulse) and it runs like dream. The out of box experience with Linux has been very good. Note that some of the aftermarket cards are actually bad and the instability might not be software related. Before 5600 XT, I used R9 290, and while it did require some tweaks to enable all features (due to being older card), it still ran relatively stable and in general was better experience than any nvidia card I had used in past.
https://gitlab.freedesktop.org/drm/amd/-/issues/929
AMD developers in that thread are chasing their tails and still haven't figured out why so many cards are having issues, and why other aren't, but as a consumer, that's really not inspiring at all.