By default esxi creates a number of users and groups including: daemon nfsnobody root nobody vimuser dcui

How secure is this default security setup? Besides changing the root password, is it advisable to modify the default users and groups? E.g. does esxi use default passwords for the accounts or anything else that could be exploited by malicious users?

My scenario is very basic and I don't require any custom users or groups as only sysadmins will ever need to administer the virtual infrastructure, and they can do so using the root account.

Thanks