I did some reading into this last year while I was stuck in bed sick and what I came across was it was to do more with light pressure than a frost line. The fro

I did some reading into this last year while I was stuck in bed sick and what I came across was it was to do more with light pressure than a frost line. The frostline has more to do with where water is likely to form than how a come to exist. Light has trouble pushing heavy materials outwards, so theres a denser percentage of them in close to a star, the lighter the material the more it gets pushed out, high percentage of hydrocarbons in outer planets. Like a giant centrifuge. So our system should be fairly standard unless the rules of physics are different elsewhere. That doesn't exclude random formations as you are dealing with super heated eddies, explosions etc... during formation. Or even stars pulling there planets in. Both our planet set up, and hot Jupiters are to be expected because its a giant chaotic exploding mess.