Re: Quelle Surprise!
"Then obviously you don’t have to be concerned about sharing email addresses."
It depends on circumstances.
A direct mail to a single person with CC to a small team or even a single individual known to the intended recipient wouldn't be a problem. Sending a BCC might be considered sneaky if the main recipient got to know about it.
An email CCed to members of a group coordinated mostly be email (e.g. my local history group to the rest of the group) is also fine - it's the only way a new member of my history group can find out the others' addresses.
A bulk email CCed to a lot of strangers is not fine. If the A/C only does bulk emails of that nature that once a year or so then there's nothing wrong with only using BCC so infrequently. But someone in an office job who needs to send out such emails (a) should know to use BCC, having been trained to to that, and (b) shouldn't be given an emailer that makes it too easy to get it wrong or too hard to get it right.