Guild/node should be tied to accounts

Health of the guild system comes from the guilds themselves. You think someone's an alt char in your guild? Talk to them about their investment into your guild. If they can't provide as much as you want from them - kick them.

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And a small guild that doesn't care about being super strict about their memebers won't care that one of their members doesn't play 10h every day. And they won't be spied on because they're just a small/casual guild.

What would happen though is the owner of that alt can just relax with another group of people w/o worrying about constantly doing smth beneficial to the guild. And those who care about spying, can still do so.

In other words, you're limiting player choice while not providing any benefits with this change. What it would provide though is more toxicity in hardcore guilds. I can already see smth like "I see you have a crafting alt. Why are you not crafting stuff for free for the guild? Wtf man?!" or "I see you have a healer alt. Have you maxxed it out yet? We gonna need it for the next raid cause we already have enough of your main class. Go do it asap".

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Except I can tell them that I can't play rn. And if my alts are not in the guild, they wouldn't know that I'm playing. But even outside of that point, you're still forcing people into smth they might not want. And while with node citizenship it's somewhat understandable because there's a ton of mechanics and benefits related to it, forcing people to have all of their alts in the same guild doesn't serve any real purpose outside of just limiting people's choice.