The notch immediately above the ABC/R’s lower paddle isn’t there by accident. As you run your finger down the bolt catch towards the lower paddle, the notch is meant to provide tactile feedback to indicate the beginning of the lower paddle. It is important be able to differentiate one control surface from another, all without diverting one’s gaze to it.
For 2020 ABC/R version 3 consists of the following changes:
* Ledge on top of the upper paddle, and bottom of the lower paddle to increase traction.