I'm about to thinking that with the mixing board onstage, it's easiest to just run single cords to everything. A box in front center stage to collect the vocal mics and monitors would just get in the front person's way. A stringer cable (connectors at various positions along the length of the snake) would likely be prone to tangle in storage, and nobody seems to be using such a thing anyway.
I do have and use an 8x8 drop cable (no box) for the drum mics when we record, but I am seeing the impracticality of trying to consolidate cables elsewhere.