I think he is worried about the splitting up of the filament in 3 channels. As if that would make the resulting output be not properly mixed/weaker. I think it is the other way around, that you get a stronger result since all 3 strands are melted more effectively in the channels, then finally squeezed together in the nozzle. The only way I see it being weaker would be if there was no heating at all, and the output was just forcefully ejected as filament strands. But I’ll stop speculating now.