That's the real benefit I see. When I saw that it reminded me the back door on a 70s station wagon that would swing all the way out.
Of course, if they'd quick making these things so fricken high off the ground, the gate wouldn't be an issue. Probably 85% of these trucks with such high suspension never get the springs bent, if you know what I mean.
My old '84 F-150 could comfortably haul a ton and a half of gravel but I could see the top of the roof and into the engine bay without a step ladder.