"I will just give an example:
1. Take the following resist nodes, from this example:(10 points in resists)
2. Use a kite shield base
3. Use purity
1 + 2 + 3 = 81% + 24% + 27% = 132% resists before you even have a single gear mod.
The implications of this are you can build your entire gear set completely independently of any resist requirements. Think characters stacking stupid amounts of magic find or heavily built upon uniques