Creationists/ IDists, why did the intelligent designer so unintelligently design the lower back?

It's so funny the way our back is made. It's almost like it was originally made for quadrupeds and adapted for bipedalism. If we were intelligently designed for bipedalism, the designer gets an F. The alternating vertebrae and soft squishy discs are ideal for quadrupeds to allow the flexibility and structural support they need to move around on all fours, but on a biped they are supporting half the body weight which they weren't originally designed to do and they put a lot of pressure on the discs. Not only that but when we sit in a chair our lower back is supporting 3 times the weight that it does when we're standing and the vertebrae are curved so they can't stack on each other nicely producing uneven pressure on the discs increasing the risk of herniation. And it just so happens that the way the weight is distributed in the back, whenever a disc bulges or herniates it herniates out backwards and towards the spinal cord where it can put pressure on these nerves causing sciatica or cauda equina syndrome. Why didn't the intelligent designer run the spinal cord in front of the vertebrae where it is not at risk from disc herniations?