I've also had a proper Thunderbolt display freak out where the entire desktop just suddenly decides to ultra-saturate/ultra-contrast. Happened twice, across restarts. After the second restart it stopped, but I can't explain it and nothing like it has happened before/since/with other machines I connect to the screen with the same cable.

Not sure about "harder to find" but the sheer number of unexplainable glitches and slowness means I wouldn't otherwise have upgraded had I known. Waiting for a higher 26.X release might be worthwhile.