Because his overall skating and choreo delivery are certainly done in a sloppy and half-hearted way and are really subpar compared to other skaters, so imo he’s always overscored in PCS.
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There was a lot of overscored pcs today but lol you had to pick on Boyang who gets the least amount of inflation. I mean if you're want to talk about overscored PCS talk about Chen being 1 pt less than Hanyu. Now that is overscored pcs.