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It's more about the potential abuse of the selection systems by any stronger guild or group of people. And the influence of that abuse on the common population of the node.
I'd imagine that a lot of players would not even participate in voting cause they won't care too much about how the node is controlled, as long as it's not hurting their gameplay. Those who don't care could potentially be bribed with items or money, because they could only benefit from that kind of trade (at least until the node goes to shit). This would compromise a scientific node.
Military node would probably require people to sign up to the mayoral fights. I doubt there'd be a ton of people willing to even become a mayor, so the pool of candidates will already be small. If a guild wanted to have complete control of a military node, they'd just need to register their members and collude in the arena (no matter what type of process the elections will use).
Religious nodes will most likely be controlled by guilds that accshare a single character or just have a super hardcore player among them. There's also a chance that those quests might require help of a guild, which would lead to the strongest guild in the node easily taking the mayoral position through force.
Economic nodes would be bought up by the same strong guilds if they see benefit in it. The amount of people willing to become mayors will be small and the amount of rich players among those who do want to be mayors would be even smaller, while a guild can easily just tell their members to pool money and outbid anyone else.
So all node elections can be abused relatively easily. But my main point is that a casual player just living in the preferred node and enjoying its services would get quite upset about a sudden war or a sudden siege against their node. And moving all their stuff (some of which might've been raided after a failed siege) after several days of dying in pvp (or not playing because of that war) would definitely push away quite a few people.
Now it could be said that this is all just the intended gameplay and that those casual players should just pay attention to the elections and try doing their best to oppose shitty mayors. But I'm not sure how many people would be willing to spend that much time doing all of that but still fail, cause it's impossible to overcome abuse of the system as a single player, and it's reaaaally difficult to rally several hundred people to do the same thing.
In other words, I'm just a bit worried about the consequences of abusability of the system. But I'm also not sure if it can be resolved somehow and I would personally prefer if the system didn't change completely or go away. I just think that this is yet another system that'll make Ashes a niche within a niche within a niche of a game.