I doubt this could damage the board, unless something produces a large spike on the mains (i.e. conventional transformer from another device).
Not sure how safe it is to switch off the desk without shutdown, since normally the last state is restored, which obviously needs to be saved before. If the state is saved from time to time and power is lost in exactly that moment, saved data is likely to be incomplete or corrupted. I guess the “shutdown” only prevents the Qu from writing to some memories. But this is just guessing, I have no insight on the internal workings.