We constantly encounter space bounding issues and bugs within space colour fill legends, which are hidden within a process that's supposed to be simple and efficient.
This is that much of a problem for us that it has put our engineers off spaces completely and they have reverted back to hatching around areas like you'd do in CAD when producing zoning drawings, not good!
It would be better if the Revit code could reference the Architectural room geometry more closely, which works fine within the linked Architectural model.
When a space colour fill legend is applied, sometimes the colour disappears from certain spaces for no obvious reason and often the fix is to click the link, untick room bounding then switch it back on again afterwards i.e. a bug in the software.
We are an MEP company and have these issues with all of the Architect's we work with, so I don't think this can simply be put down to 'user error' when the results are consistent.
I appreciate this is a complicated issue but I think it needs to be addressed.