The voice chat requiring a phone app is something that makes me extremely anxious about the quality of online play. To play the game effectively with voice chat I'd have to get a bluetooth headset of some kind, because there's no way I would be able to hear people talking from my phone over the music coming from the game on my TV. If I don't want to talk (which is usually the case), I still will have to run the app to listen to what people are saying because the voices won't be streamed through the television.
I am at least glad we will have USB keyboard support again. But I suspect I am in the minority of people who will use one and most people will be opting for voice chat. Hopefully the game at least communicates state information above players (such as, this player is the one talking).
On the topic of USB keyboards, there are some very neat 3rd party USB keyboards that let you put the joycons directly into it. I am considering buying one for use in this game.