On one hand I can totally relate to the weird divide between the PC-users and the dumbphone crowd.
On the other hand though, why would anyone choose to voice-chat instead of typing? Voice-chat is for mundanes. Trying to communicate in audio, filtered through microphone and speaker quality issues, is beyond annoying. It isn't like speaking is easier than typing anyway, and reading is far easier than listening.
Plus while I have a Discord account, I barely ever use it. I only got it because some mods and suchlike insist on only allowing downloads via Discord, or only include installation instructions there.