I think the key is "if used in a reasonable manner..." That's an statement for a different discussion. I get your point though, and I'll reiterate my original statement that it boils down to personal preference and/or experience. Need? Well, that's definitely open to discussion.If used in a reasonable manner, and there's space (and labor) to locate a large bass rig, there's really no practical downside, but often it's "necessary" within a player's mind, or where a visual aspect might bring something unique or make a statement about the band.