Earlier quoted context omitted.
When I played CS:Source in a clan, we had Teamspeak that we rented a server for. When I played WoW and Guild Wars with a small group of friends, we used Skype because it was free. Early-to-mid 2000s.
I must be a mammoth, as I still use Skype for gaming. What does Discord offer, that Skype doesn't, and Steam is running anyway too? Lately Skype became too buggy to use as IM, but sound is still solid.
How about "Not being too buggy to use as IM"?