No one actually knows how to lculate what speaker cable they need

No, I would never consider trying it. I think between this thread and the sister thread below, you just about covered it all. It is just not practical to use large gauge wires in most installations.

https://forum.audiogon.com/discussions/how-to-select-a-good-speaker-cable?page=4

Mr. Dill

If so, why do yo keep being involved in those threads?
I challenge your say: It is just not practical to use large gauge wires in most installations.
For those it apply (high DF and medium to long cables) it will improve sound significantly. Not implementing it, will keep the sound muddy and poor.

WOW i just lculate its way cool.