Here's a recent situation for a Revit MEP firm. They download the architect's model. They import the model. They need to coordinate their design with a good number of lab cabinets and equipment. When they open the views to see the labs they don't see any equipment. Curious, they open the pdf's they were sent. Casework and equipment galore. Now they open the file that they downloaded and take a closer look. Sure enough, there are cabinets and equipment. Closer look still...oh, no! They aren't families, they are detail lines, drawn in the view. Some are groups, some aren't.
Now we know why they don't show up in the RME model after linking the architectural model in. Detail lines are view specific so they won't show up unless they override the view to show the same view the detail lines are in within the architectural model. Doing so unfortunately introduces other annotation they don't want to see. Nuts and double nuts!
Moral of the story, if using detail lines seems like the expedient thing to do, just ask yourself, "Who does this affect downstream?". Sometimes you just need to say no. If you can draw it once in plan in the project with detail lines you can expend just about the same effort to make simple plan only families and be nicer to those you hope to collaborate with.
I saw this bumper sticker on a Facebook site called PA of the Day.
They post a picture of various Public Address (PA) systems/equipment each day. It's a site that appeals to a certain group of people. A twist on a familiar drinking and driving bumper sticker and for the purpose of this tale, "Friends don't let friends use detail lines instead of families!".