Sieges should be open
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So right now city sieges are restricted to 30v30. However if games like early Albion and New World have taught me anything, it's that these things should be open and inclusive. Albion suffered from the having your guild funnel resources into a select few players so they could GvG, NW suffered from settlement owning guilds taking their 50 most geared players, and excluding an entire faction.
I don't see it playing out any different here. Sure you can make the argument that "zergs" are going to zerg, but that's where politics comes into play.