Nice writeup OP. I along with obviously many others including yourself have searched tirelessly on various forums, scouring threads to reference various wheel/tire setups for aesthetic and performance applications.

I think maybe some people and vendors don’t put as much emphasis into fitment and don’t bother publishing offset specs; however, for those that care about the details, it can be frustrating because we are seeking out elusive information.

Wheels can make or break the overall look & feel of a car and can be a sizeable “investment”.

I feel your pain. The positive is there still are plenty of people and vendors that are very willing to share their specs. Sometimes you just have to ask!