It would be helpful for all games, if I could communicate with random people online. What if I find someone I enjoy playing with while playing Mario Kart...I'll never see that person again because the game doesn't give me any information on his/her friend code!!
If Nintendo could just change its ways....maybe if I find someone I like playing against when I play the random modes...maybe...just maybe...I can add him to my friends list FROM the game itself!!
And not only that, it would give us something to do while waiting for a game to start if we could write text messages to each other before the race. And if we finish the race early, we can cheer one of our friends on by writing "Go _____!!" There doesn't need to be live voice chat for me, as I'm a bit shy with my voice to be honest, but letting us at least write text messages to random people would go a long way.