Really? You don't see how a gamer centric software that put text and voice chat in a single solution, with the ability to join multiple servers and hot swtich between them on the fly, that let's you start private chats in a single click and keeps your entire history for all the channels and all the private chats that you have ever been part of, that has built in streaming and screen sharing capabilities without any additional configuration, became successful?
Nobody needs "performance" (whatever that means in this context) from Discord unless you need hundreds of people in a single voice channel. Its also stable AF.
Don't get me wrong, Discord is on a fast track to enshittification, but when it first came out, it made so many things so simple and accessible. There is still not a single solution that even comes close what you can do with Discord to this day.