You all remember back when ramps had that weird lip at the top, right? Now that its been removed, why do we still require 4 pillars to place a ramp? While it sounds logical on paper, I have a visual representation of this problem that will probably change your mind:
Please heed the fact that this is a bit of an old picture, but still a relevant one. As you can see in the picture, it looks like I should be able to place a ramp there, but lo and behold I am unable to. When I use 4 pillars instead of 2, it allows me to place the ramp down.
tl;dr: I think the ramp should only require the rear two pillars to be placed.