Bolt torque discussion

Except for the misprints such as rocker shaft bolts I torque mine to whatever the shop manual says, unless using some aftermarket setup that says otherwise. Why is this a mystery? You can look up standardized fasteners, grade 5, grade 8, etc, and all of that info is published.
Thanks for the reply. I posted this thread as a carryover from another thread where there was indeed plenty of disagreements on the torque when using studs.
Rather than hijack the other threads and out of courtesy I started this thread. Eg arp recommends a stud torque of 140 lbs with oil for 1/2 inch studs 45 lbs higher than stock.