Aviation: NAV questions from an Aviation novice?

1: Reviewing procedure charts for Southern California, I see one of the runways, 6L If Im not mistaken, at LAX, is marked "DME required." So am I understanding this correct: Departures from this runway, per the chart, must always be a DME departure? what logical reason would FAA require a specific runway to specifically be a DME departure runway? Why cant it also be a GPS departure? meaning, while the pilot is achieving altitude, the co-pilot would monitor GPS and then advise the pilot when to make the turn to intercept the VOR. 2: Approaches: Is it required for pilots to get ATIS clearance to enter the cl B airspace at descent altitudes? Or can they just enter the airspace and proceed on their way toward the traffic pattern without clearance? I guess an example would be an airline pilot, whereby thats his regular route, and he's supposed to be there. hes trying to meet a schedule, he might be low on fuel, and it doesnt seem logical that they would deny him clearance to enter the cl B airspace (Airspace surrounding LAX, for example.) 3: aren't sectional charts and terminal approach charts redundant to a large extent? 4: In bad weather, do airline pilots transition from the VOR to the traffic pattern under instrument flying? or do Airline pilots most of the time fly VFR? ...my weakness at this point is correct controlled descent of the aircraft, and proper coordinated rudder turns for a precise intercept of the vor. I dont mean to compare myself to the airline pilot. These questions for me would be more relevant to being skilled as a GA pilot. I use the example of the Airline pilot because the airline pilot uses all these skills in a structured flight from point A to point B, encomping all the mandated procedures.