You need three things to wage a war: money, money, money. Assembly lines tend to cost more than what they produce. By many orders of magnitude. Someone would have to invest enormous money in them. Let me remind you that jump-gates and tradelanes were considered expensive even for Houses.
Smaller groups don't have that amount of cash and even if they do, they rarely have a central governing body which would be able to accumulate required funds and spend them on such investment.
Supply lines are frequently attacked. No constant stream of parts going in = no constant stream of capships going out. You surely have seen what effect can a minor disruption in tranport mean to a factory (minor, i.e. flood).
Political issues: many commodities are produced solely by one group/nation.
Feel free to PM me regarding any grammar/spelling/other language mistakes I have made in my posts.
