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The latest Ashes of Creation development update brought about some changes to the Node system, this video will provide an overview of the node system, the different types of sieges, and give my thoughts on them.
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Only the vassal of a lvl 3 node (the lvl 1&2s) get destroyed after a siege. If for instance a metro is destroyed, the vassal 5s can fill in the newfound metro depending on who gains the appropriate experience.
Also freeholds won't necessarily be destroyed like in-node apartments but can take on the new nodes citizenship if they complete a quest.
Unfortunately you can only join one node at a time. Alt characters specifically designed for artisan crafting may have to work without nodal buffs if you are focusing on your main character. This nodal restriction may become responsible for the rise of multiple accounts, we will see.