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Pathfinder path precision
When working in Illustrator I get edge artifacts after dividing shapes. After perfectly aligning the shapes I would expect a clean edge but maybe that’s asking too much. Here’s what I mean:
I have two identical rounded rectangles, one that I’ve rotated 45 degrees. I’ve aligned the rectangles on one end as best I possibly can.

Now, I divide these two layers creating three shapes so I can individually color them. If I move one of the shapes, it’s clear the edges did not divide along the edge. Divide leaves artifacts behind. This might not be noticeable in many cases but it’s sloppy and requires a lot of cleanup to get simpler, clean shapes.
My goal is to divide two shapes in order to get three shapes so that I can color each shape individually.

Is there a way to avoid getting these artifacts or is Illustrator just not that precise? Seems pretty lame considering the “professional” software and cost.
I’ve turned off GPU and anti-aliasing and still get the same results. All the snapping or align to pixel grid is off as well. I’m working in a document set up for print. CC 2018 version 22.0.1.
One solution I’ve found is to use an outline instead of a fill on the shapes and then divide. The artifacts are still left behind in the form of a ton of “little lines” but I can hide the three main outlined shapes and delete all the little lines. Then I can change the shapes to solid fills. This work around is not ideal and also time consuming.

