I would be much more concerned about the evident rusted-out condition of the ventilation core of the rotors than actual surface condition. This will seriously impact cooling ability and probably balance more than will a worn surface. Absolutely, new rotors are necessary here.
Steve
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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7
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