To be honest we’ve always remodeled everything in Max only using Revit as something to trace over. Revit geometry is just not designed or organized with game engines in mind. There’s so much cleaning that its actually quicker for us to remodel everything and have control of UVs.
However that’s just me and my team. Other’s here might have a solution that uses Revit geometry. Maybe through Datasmith for Revit which I haven’t messed with.