Every day when working with imported DWGs made in other software I am very limited by not being able to see line stipple and line width.
It is also very limiting not to be able to easily produce proper drawings with different line styles, e.g. for plot border, fire division, thinner lines for less prominent objects such as furniture and scale figures, and the like in SketchUp.
Currently users have to rely on a complex workflow with stacked viewports in LayOut, and edges drawn manually in LayOut loosely on top of viewports with no link to the 3D model. This is very cumbersome and still doesn't solve all use cases. In my view stacked viewports in LayOut is a hack that shouldn't be needed in the first place. Also I think LayOut should be used for annotation and layouting; even abstract 2D edges such as plot borders and projections from behind the cutting plane belong to the model where these can be modified along with other entities all at once. These lines should also stick with the rest of the viewport when it is resized, scaled and moved in LayOut.
To implement this functionality in an intuitive and user friendly way I suggest a new concept called Edge Types. Edge types would work very similar to materials but instead of being a color or texture it would consist of line stipple, line width and line color.
These edge types could be browsed, created and edited in a window similar to the material browser that users are already familiar with. They can then be applied, or painted, to the model just as materials are (but obviously not to faces).
"Painting" a group or component with an edge type would have it cascade to child edges just as is already done with material. This would give users powerful control to quickly style large quantities o edge but also allow users to style individual edges if they want to.
The Edge Settings tab in Styles could be given an option to override all line display with the default line appearance, just as Monochrome setting does for Face Style. If a user wants to create a quick visualization without the techical drawing feel this could be used.
Lastly, I think this would be good for marketing. Often people ask why they should pay for Pro when Make does most of the job. This feature is essential for many professionals but more or less useless for most hobbyist and would fit perfectly as a Pro only feature. Support for edge styling has been requested for years and I think this could definitely be one of the greatest features added in many, many years. In my view far greater than dynamic components or solid tools (or both combined). This could be the feature of SU 2018.