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This is fascinating.

One thing that worries me: billing. If I have six different AWS accounts will I have to update six different places any time my credit card expires?

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AWS Organizations (https://aws.amazon.com/organizations/) is supposed to solve this for you. If all your accounts are in the same Organization then you get one bill instead of six.

You can also use AWS SSO (IAM Identity Center now) in conjunction with Organizations to federate into your AWS accounts using any SAML IdP.

As the other commenter notes, no, you still have just one bill.

Better, though, that one bill is broken down by account so you can see where the money’s going.

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