Then your recollection is faulty.
Given that removal of the battery is not necessary, and that a load test is a simple two minute (includes time to remove tool from storage and stow it again) test, It most certainly IS the first test a tech should do, since the rest of the diagnosis involves creating a load at the port. But, given that the load (an inverter) at the port ALREADY indicated a low voltage condition AT THE PORT, the next place to check is... the battery. So you are advocating ANOTHER check of the obvious, before proceeding to check the variables?
Except that we already know from what the inverter did that the voltage is low. No need to check again.
How do you know you are losing 2.3 volts if you haven't checked the battery under load? Maybe the entire system, including the battery, is dropping that
2.3 volts. As I said in a previous post, the only way you are losing that voltage without popping a fuse is if the battery can't supply the voltage. Unless you are willing to agree that there is a significant hazard in the wiring catching fire, which would be an engineer's fault for not spec'ing the right wire guage.