If you are using the exact same file in RB, and not changing anything other than volume, there is no reason.
If you want to add other tracks, etc., it would be beneficial.

BB can make street-ready files quickly.
If, however you find the files do not sound good through the Cube once rendered from BiaB, you may be able to quickly touch up the mixed down file in Realband using EQ or whatever is needed .. without having to 'remix' them from scratch.

In other words, if the Cube sounds too bassy, simply working the EQ on the final wave file may be all you need.


I do not work here, but the benefits are still awesome
Make your sound your own!