Hi Grace,
My colleague @SarahBell sent me a great example of the workflow involved in taking a drawing in sketchup and importing it into Illustrator for restyling: https://www.youtube.com/watch?v=MDCdl7yW_iM
This illustrates what I was saying earlier - the drawing is no longer 3d, it's converted into its 2d form. It also illustrates the volume of work involved after the fact to achieve even small changes in symbology - exporting the drawing multiple times to remove "blocking' features such as the glass, or features that overlap with others such as trees.
While we could consider ways to achieve this workflow in ArcGIS Pro/Maps for Creative Cloud, Pro scenes (unlike sketchup) contain many layer types which are not strictly vector that would greatly complicate even the manual version of the workflow from sketchup.
We will also take this as input in terms of future 3d symbolization requirements.
Thanks for bringing your workflows to our attention - we will definitely continue to take these requests into account for future versions of ArcGIS Pro and Maps for Creative Cloud.