If the entire recipient list isn't disclosed to the recipients, then there would be no need to randomize it. So, bcc meets his goal of not disclosing the particular order in which he entered the email addresses.
Granted, in rare cases, it is desirable to disclose all recipients' email addresses to each other, but I'd personally prefer it if that were the exception, rather than common practice.
> Granted, in rare cases, it is desirable to disclose all recipients' email addresses to each other
It might be rare for some people's use of email, but it's hardly rare. It's essential if it's group email and others in that group need to be able to chime-in to the rest of the group.