Hey man, good questions, but I am asking about the generically accepted way to get a bass amplified in a band setting. I will try to clarify by saying what the components in a guitar rig do and hoping that you can point me to similar info for the bass.
Again, no matter who you are or what style of music you play, guitar signal flow can be typified as
Guitar -> preamp (does EQ, adds clipping/compression) -> power amp (makes it louder) -> cabinet (output of signal, as well as strong frequency tweaking to focus the tone of the guitar on its more pleasant central frequencies while doing a sharp dropoff around 4-5kHz to minimize its unpleasant highs). You can additionally add a mic to the guitar cab, usually done off-axis to further reduce sharp peaks that would grate your ears in the PA speakers.
That's traditional guitar amplification, how you get a pleasant sound to sit in with the band.
Bass is a whole other ballgame. While the cab is a gigantic part of the guitar's sound, the bass conversely seems to me like it would sound good through an FRFR cab. People send their bass to FOH through XLR from their preamps, completely bypassing any tone-shaping the cabinet does. This is unthinkable in guitar-world.
So what I am trying to understand is what a cab does for the bassist. On the B3n, you can blend the dry signal with it if you choose (for the G5n cabs, it's more of a binary decision and you'd gonly leave the cab model out of your chain if you were plugging into a real guitar cab). Whereas bassists can take it or leave it, it seems?