It’s not a matter of too much faith. Expecting teams to figure this out on their own is quite frankly unacceptable in my opinion.
If you look at other motor controllers, like the Talon SRX, their datasheets will spell out exactly what current will be supplied under what conditions. Furthermore, if you look at virtually any name-brand electronic component, the datasheets will have far more info than you know what to do with, and only in rare/edge cases will you have to do your own testing of a component.
Obviously neither of these examples are quite like V5, but that doesn’t mean VEX and V5 should be held to a lower standard of documentation. At least with the Cortex, current limiting was done by PTC resistors, so anyone that opened a Cortex or motor could easily figure out what sort of power delivery to expect. But, if the current limiting is controlled by firmware, there’s no way to know what’s going on without seeing the source code or spending far too much time reverse-engineering the firmware/algorithm.