[Calahan]

Gathering all your forgers in one or two places just to save on MM is a guaranteed way to get yourself in major trouble to stuff like lab fires or mass remote killing spells (flames from sky). With the former event putting the majority of your hammers and boosters out of commission for a turn, and the latter losing you said hammers and boosters. And domes won't help against a concentrated ritual attack, which is all the more likely to happen if you enemies notice your gathering all your important mages in one place.

Common sense says to have your forgers spread out more to avoid them becoming the lucrative target they become when gathered together. But the more spread out they are, the more MM increases. Hence the claim being made that banning Hammers will reduce MM. (and this is a thread about reducing MM after all)