Line .5 increments
When using Lines, the automatic .5 lengths/spacing make it super annoying to work with, especially as a lot of design frameworks are speccing borders/lines as %transparencies. With XD as it is, I have to manually delete the last three digits in the width and/or in the X/Y values to deliver a polished product and it feels like an unproductive waste of time. Maybe all lines can be dragged to .5 increments rather than 1 pixel increments, or they smart sense borders and borderless divs and stop before then. Idk what the answer is exactly, but it's always been an annoying part of XD that I don't experience in Sketch.