"Why should the situation with Skype be any different?"
Well, do I really have to explain?In order to use your Email Client, -you- have to install it, you and nobody else. In order to use Jitsi, you have to install it *and make another person do the same*.
The latter one isn't neccessary anymore with a webbased solution. That's the advantage. Ii don't understand how one can't see this.
