As someone with no experience in that field, why is that? Is a PCB file too low-level and would be like posting assembly/executable code instead of the source of a program?
In a simple system the PCB is enough to figure it out, even if you have to deduce what each soldered component was.l - like a simple soduku.
A large complex CAD or PCB system will have thousands of pieces and parts and it would take much longer to work out which each actually was. A PCB doesn’t tell you what is soldered on the holes (though sometimes it’ll have R23 telling you it was the 23rd resistor, but not the values, etc).
But that being said, fair point. The PCB file is sufficient in this case.