Here is some info from a GDC interview years ago. It's the 2nd question that is on topic. As for the first segment I posted below, at least we are almost guaranteed voice chat!
IGN: Brawl seems like the perfect game to introduce a Wii headset for voice chat. Why have you avoided this?
Masahiro Sakurai: Well, when I first started making Smash Bros. Brawl, I thought it would be wonderful if online battles between friends had voice chat and potentially keyboard based chat as well. But there are all sorts of rules and regulations regarding communication on the Wii platform and so it was apparent to me that it just wouldn't come together, we weren't going to be able to do it, so we decided to cancel that feature. I'm very sorry about that. But if you're really desperate for it, you could set up Skype by your game station and go at it with a friend if you like.
IGN: Smash Bros. is a very competitive series, but you have avoided detailed online stat tracking and leader board ranking systems for Brawl. Why is that?
Masahiro Sakurai: Well, I'm sure that people hitting ranks one through 10, were there such a ranking system, would be incredibly pleased with it and having a lot of fun. But, you know, it's not fun for everybody involved per se if such a system were to exist. I was asked this time around to try and get Wi-Fi into the game and so certainly we've managed to get wireless battles so you can play with people in other places. But it's really a game in my mind that has been designed to be played with a smaller group of people -- be that a group of friends or within your house a group of family members -- competing in the small circles and not really worrying about winning and losing so much as the process that gets you there. That is where the fun should hopefully be for a lot of people. It can also be kind of trying and painful for some people who want to be at the top and think that they're really good at Smash and they look at their online ranking and they're the one-hundred-thousandth best Smash Bros. player -- those are some of the reasons I've decided not to go with leader boards.
http://www.ign.com/articles/2008/02/21/gdc-2008-sakurai-on-super-smash-bros-brawl?page=2
Let's just hope his gaming philosophies have changed. How did things work in Kid Icarus?