A long time annoyance has been that when exporting ABD models to either IFC, dgn or dwg, material textures are not exported or baked into elements.
The only way I can see to export with textures is via idgn, which although a good file type, cannot be imported or opened in most other programs(revit/navisworks/Solibri/Rhino etc).
This makes some aspects of coordination very difficult, as all objects appear either blank/white, or garishly colourful as per the model element colour. ie. not realistic. Additionally, it adds another task into visualisation, as commonly ABD cannot handle rendering large Aecosim models without crashing. meaning Microstation has to be used, meaning ,material textures have to be applied again, additional work that should not be neccessary.
At the very least, materials should be able to be baked into a straight dgn export!