Revit wont allow you to tag a bundle of reinforcing bars in a column or wall. For example, if I have 8 bars in my rectangular column, I need to model 2 lots of 4 bars, one on each face (or 4 lots of 2 bars which ever way you need to achieve you reo positions). I want to tag the total of 8 bars, yet I can only tag the 4 on either face.
If I have a circular column with 6 bars, I have to array the bar around the column. This only lets me tag 1 bar at a time, not the total of 6 bars.
This doesn't reflect how the industry calls up reinforcement on drawings.