Especially on s-curves, the coupler needs to have enough room of movement to stay properly connected to the other coupler. This is not be as much of an issue without the electrical connection.
Pin assignment of the electrical coupler
Technic pins in 1/2 length are common in blue and grey. Lego does not sell them in black sadly. Blue or grey pins don't look good in this exposed position most times. Luckily there are other stores that sell them in black. I'm not saying who, nor linking them, but there are some famous non-Lego stores out there that do.
As an idea on how the cable management inside of a boogie could look like, here is a pic of one of mine:
Underside of a boogie on my tender
The buffers are made of:
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