You didn't quite read that correctly.
There was no decision to not allow for an email system on this new forum.
There was however, a decision about which software we would use. There are many many factors that needed to be taken into account when making that decision. Unfortunately there was not one choice of software that had all the features that we required - there never is. So compromises had to be made, and some features were not going to be available.
If it wasn't the email system, it would have been something else.
I do regret the loss of the email system, and I assure you that it is not something that was decided we don't want. But like I said, there were tradeoffs that needed to be made, and unfortunately the email system was one of the things that was sacrificed for the greater good.
But it is NOT the end of the world. There is great demand for email support in vBulletin, and the developers of the software have acknowledged the need. While there is no confirmation yet, we are hopeful that these features will be available in v3 of vBulletin. I'll keep you posted. Until then, enjoy this marvelous web interface ! Isn't it so much better than the old one, and so incredibly fast ?