What can be done with the reverse-engineered data about the PCB? You have a working one, you reverse-engineer it, and then ultimately you can make your own?
It can be used to find connection points to signals that would otherwise be inaccessible or at least hard to get to. This has come in pretty handy for the latest wave of Nintendo Switch hacks like Picofly. The scan-sand-scan approach [0] has the advantage over this hack where you can do something like the "kamikaze mod" [1] on the OLED Switch since you know where stuff is, not just what is connected to what.