Honestly, other than True Strike which is absolutely a Newbie trap in the PnP and here and has dubious use with only certain circumstances favoring it, the rest are the fault of the game either having homebrew that muddles the chance to hit or be hit, and likely needing to convey certain concepts better. As someone who plays D&D a bunch, things like the Ability Scores and and Attributes made sense to me and I read them clearly, but someone not familiar with the systems likely would need more explanation in a much clearer fashion.