Re "...and so many km of electrical wizardry..."
Makes me think of an AC mechanic that told me that Airbusses are dimensioned in inches, which makes me worry about the safety of the darn things.
Whatif an engineer in Toulouse made an error adding 15/72" to 17/48" and now that fuel hose is 7/144" too short and will fall of in mid flight with fuel guzzling out of the altimeter and onto the the captain's cigar ?