The setup on the side of the stage is typically for the monitor engineer (monitoring in-ears and/or wedges). This is different from the FOH engineer.
So why does the band these days set their sound guy up beside or on the stage? Because they do not know what they are doing.
Mics: Schoeps MK4, DPA 4061, AT953
Preamps/BB: Nbox, tinybox, ST-9100, CA-UGLY, SP-SPSB-10
Recorder: Sony M10, Edirol R-09, Zoom H4n, Zoom H6, Tascam DR-2d
Video: Sony HDR-CX520V, Sony HX9V, Panasonic Lumix DMC-ZS3, Panasonic Lumix DMC-ZS100