Is anyone at Larian studios familiar with math and probabilities?
Passing one check requiring 16 or higher on a d20 = 25%
Passing two checks requiring 16 or higher on a d20 = 6.25%
Passing three checks requiring 16 or higher on a d20 = 1.56%
And when all three checks are required to pass for an outcome to occur, well, good luck.