Push to talk is most certainly not obsolete. I (and many gamers I know) use push to talk for the privacy of being able to choose when your microphone is activated.
Its even more useful in competitive gaming and/or streaming where many want to chose what to say to their team/friends and themselves/the stream.
Its even more useful in competitive gaming and/or streaming where many want to chose what to say to their team/friends and themselves/the stream.