On AWS, you can create multiple sub accounts under your organization. If your account has sub accounts, you can log into those sub accounts using switch role, and you have Admin access to that sub account, without having to use root user credentials.
On AWS documentation (https://docs.aws.amazon.com/general/latest/gr/root-vs-iam.html) there is a list of things that are exclusive to the root user, but they seem to apply only to the top level AWS account. For instance, if I switch to a sub-account, it looks like I can close that sub-account.
In summary, what can the root user of a sub account do, that cannot be accomplished via role switching? Is it possible to delete the root user of sub accounts? What would be the dangers of that?