Are we excluding james harden?
I mean, Harden is all-time bad, but Julius is something different entirely.
Harden is still a supremely skilled guard, but his problem has always been taking shortcuts and exhausting loopholes during the regular season, but that ends up always getting exposed in a playoff environment. You can't spam for fouls the same when refs allow more contact and don't fall for the same bullshyt during the regular season.
Julius' problem is he's nearly completely devoid of skill. He's a bull in a china shop. He thrives on easy scoring opportunities and high volume, which he can get away with doing in the regular season. Once those opportunities dry up in the playoffs and he's actually game-planned for, he's got nothing.
From the regular season to playoffs his eFG% goes from 50% to 38%
From the regular season to playoffs his PPG goes from 22 ppg to 16 ppg
Assists go down, rebounds go down, steals go down, blocks go down and turnovers go up. Nearly every single metric or measurement you can think of, he's drastically worse in the playoffs compared to the regular season.