Yes, Trump performance decreasing as mail-in votes were counted was predicted. But people also predicted a lot more of a margin for Biden than actually appeared, and if we had had those margins the races currently under contention would not be. Sure, PA might still be waiting on another 100k mail-in votes - but if Biden was 300k in the lead, no one would really care.

49.7% to 49.2% is a HELL of a lot closer than the D+6 projections I saw.