To completely replace notability and draw me back to my Android tablet with Goodnotes forever, Goodnotes for Android would include:
1) A ruler, rotatable with degree settings
2) Auto arrows
3) Dashed and dotted lines
4) more eraser sizes than just the 3 given
5) Syncing to all my tablets (ipad too) with Googledrive
6) A choice between a rectangular selection tool and free-form selection tool