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Think about it. Interlaced video has twice the frame rate of progressive video. Deinterlacing throws out half the temporal information by replacing alternating interleaved fields with calculated guesses of what would be in those fields.
Go to a store which has 60 Hz and 120 Hz displays next to each other. If deinterlacing was "perfect" there would not be a need for 120 Hz, would there?
FWIW, 120 Hz displays also use "educated" guesses to create the "missing" fields but they keep far more of the temporal information.
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