As you rightly point out you can't judge the condition of the discs visually alone. They need to be removed and weighed to assess their life remaining. They will also be junk if they have too many visible flaws in terms of cracks or chunks missing. They're more likely to be trashed due to careless wheel removal than anything else (drop a wheel on a disc and there's a high probability of damage).
Mileage is largely irrelevant if the owner didn't brake much, but I've known D3 owners take their cars round the 'ring, so don't rule out track/heavy use!
The technical dump includes info on the inspection process for the discs - if you're looking at a used car to buy, ask to see the last brake report where that process has been followed. I'll bet they've not been checked, however.....at the very least the last time the pads were changed may indicate how long it's been since the discs were assessed.
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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