Disc Brake info!

In addition to eliminating flat spots or warpage, resurfacing the rotors gives your pads a "different" friction coefficient to work with also. After many repeated heat cycles from stopping the metal actually hardens and can compromise quality braking. Taking a few thousandths off makes for a smoother/quieter pad-rotor engagement.

I wouldn't lose any sleep if min. thickness from turning rotors is below "discard" thresh hold by a tad.

The newer rotors (cheap/import) appear to warp more easily than the OEM ones from way back.