I disagree about the cable thing. I've seen bikes like that from the late 80's, they don't pull. The pulling thing can be checked by the Miyata owner simply by turning the bars from one extreme to the other if he hasn't already done that. I personally don't like the look of the wires like that, I like the loop look, but that's just looks not because it won't work that way. And the 1988 Miyata catalog shows the cabling exactly that way:
http://www.miyatacatalogs.com/search?q=1988 Just scan down to the team model. This was feeble attempt at trying to be aero.