It comes down to good soldering practice... nothing more. Call it insurance, if you will. What you don't want is wire on the POWER/GROUND that is too thin, causing resistance on the line. This is particulary important for these two wires.
Many an installer uses 30 guage for all wiring, including the POWER/GROUND. The DUO and Magic line had no problems with 30 guage across the board. On the other hand, any installer of the DeeEmmEss line knows full-well the reason behind thicker wiring on these points. So, common sense and solid soldering practice would suggest sticking with 22 (or so) guage on these two points.
The entire copper border around the mainboard is GROUND... it can be soldered to at any point.
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Oshawa modder... up there in Canada.