Our biggest problem with this behavior is the following scenario where we have an application process that users can apply for several products through.
We wanted to have a fallout report for the different steps with a panel level segment drop down filter for the different products over the top of this. However, if a user applies for more than one product in a visit data from one products shows in the fallout for the other which is a real pain 
It means you potentially have to build out 20 fallout reports where you could have had 1 fallout report with 20 drop down options. This feels like a very common use case that can't be properly accommodated.