The obvious reason to not race Fleche is timing. He's been scheduled to race Fleche and Liege every season he's focused the Tour IIRC.
There's some individual differences and preferences when GC riders like to come down from altitude and taper, but Roglic really seems to prefer not to race a week before a GT judging by the fact he hasn't raced the nationals in a non COVID TdF year since 2017. The exceptions are racing Romandie in 2019, which I think most of us say was a mistake, and Burgos in 2023.
There's some individual differences and preferences when GC riders like to come down from altitude and taper, but Roglic really seems to prefer not to race a week before a GT judging by the fact he hasn't raced the nationals in a non COVID TdF year since 2017. The exceptions are racing Romandie in 2019, which I think most of us say was a mistake, and Burgos in 2023.
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