Hi erik, it is possible to get rid of those but it's not really worth worrying about. To get rid of it you'd need to delete the 2 faces on either side of that edge you want to remove, then extrude out a longer surface from one of the now open edges and use Edit > Join to glue your new longer extrusion face back in with the main object. But you won't really gain anything noticeable by doing that.

In the future I do want to update boolean union to get rid of those - it does know how to get rid of them when it's 2 coplanar planes being unioned, but it doesn't know how to do it for 2 extrusions that are lined up along the same direction right now.

- Michael