Illuminating The Shabbos Blessing

There is a controversy that has been around for some time, and a passage from our daf may ameliorate it somewhat.
There is a mitzvah of hadlakas neiros every Friday before the onset of Shabbos. There is no question that before the advent of electric lights, the Shabbos candles would provide vital illumination for the house.
The Shulchan Aruch discusses a situation where several families are eating together and all of them want to light Shabbos candles in the same place. The Shulchan Aruch says that there is a dispute whether more than one person may recite a blessing over the Shabbos candles lit in the same location. After all, once the first person lights his Shabbos candles there is already sufficient light; additional candles are unnecessary. However, the dissenting opinion reasons that additional candles provide additional light. The additional candles are not crucial, but they still provide some added light.
The Shulchan Aruch concludes that in such a situation it is better if only one person recites the blessing and the rest of them light candles without reciting a blessing. The Rema writes that the common custom is that everyone who lights candles in the same spot recites a blessing. Still, Rav Nissim Karelitz advises that it is preferable if one person recites the blessing aloud and everyone else has in mind to be yotzei with that blessing.