Primarily the residential structures I am involved in are complex - hence why they call us. Lots of different roof planes and overbuilds, horizontal/vertical offsets everywhere, large openings - the usual. I happen to also be in a state where building things to code is still an idea many are...
When special provisions are not provided to ensure shear transfer to all anchor rods, via plate washers or sim., it is often assumed in the design that only half of the anchors will resist the shear. This much I can agree with, considering only the front or back half of the anchors is logical...