I think this is probably true, and you can see why a person might be reluctant to forward when they have to bring in the address(es) of people they want to forward it to individually, enter them in separate fields that may or may not be the way they can easily copy/paste from their email client, etc.
On the other hand, at least one of the other ESPs (and I suspect more than one) who continue to offer this feature, only send a LINK to the online version of the email rather than forwarding the ACTUAL email. This is why the way Constant Contact was doing it in the 2nd gen editor was better than some of the others. I sincerely hope that if they DO bring this feature back they do it the way it was before, where the ACTUAL email is forwarded.
I never used it in the past but suddenly found a great need for it. Very disappointing to find it no longer there. One more vote to put it back. Can't be that hard.