Cinny exists as a discord-like client, thing is, Matrix is mostly the text chat part, it doesn't implement voice chats or anything. Also, the space/room system works differently to discord server/channel
It's in progress. Keywords: MatrixRTC, Element Call
https://matrix.org/blog/2024/10/29/matrix-2.0-is-here/#3-nat...
The same can be said of space-room vs server-channel. Of course a space has different semantics, the space doesn't own the rooms, etc. But they can be made to be nearly the same for an end user. In general organization of resources is much looser and less opinionated on Matrix. But an opinionated app can also paper over this to force a stricter hierarchy, while offering advanced users the ability to make their own spaces, etc.