We've got some decidedly non-engineering types running around in Freedom without too many problems.
Red-lines are associated with saved viewpoints, and those can be exported in reports, much like scribbling on a printed sheet. The red-lines can be seen in Freedom but can't be modified in it.
Change documentation in 3D models is less straightforward than more traditional 2D drawings. There's a lot more hand-wavey, kinda-sorta, fuzzy logic involved.