To be fair, all of those are pretty old (the T520 is from 2011), so it's expected that they would work flawlessly---it's the very new X1 Extremes and a couple of other models that are problematic. For the most part, staying one generation back is enough to get very good hardware support.

My current generation T495 works perfectly with the latest Fedora and Ubuntu. The last revisions of Fedora and Ubuntu work perfectly except for the fingerprint sensor.

Even on my old ass w540 that finger print sensor doesn’t really work all that great.