You're a very negative nancy :P
The cables aren't much compared to the battery weight shift, and more importantly the cable weight is distributed out fairly evenly. Shifting weight from front to rear is always good (unless you actually manage to cross the 50/50 mark). Shifting weight towards the center of the car from where it originally was further out in any direction is always good (driver-vs-passenger can always be corrected later with corner balancing).
Not everything on these jobs may be perfectly ideal, but they still do a lot of good. The placement didn't "defeat the purpose".
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