Since Matrix, XMPP, etc. already support most (if not all) of the features that Discord offers — text, voice, video, threads, bots, roles, federation, etc. — would it theoretically be possible to just replicate Discord’s UI and UX and build it on top of the Matrix or XMPP protocol instead of starting from scratch?

I mean, sure, there’d be some challenges with existing third-party clients, like

Matrix:

Element X,

Nheko,

Cinny,

FluffyChat,

XMPP:

Aparté

AstraChat XMPP Client

aTalk

Beagle IM

Bruno

Chat-O-Matic

Chatty

Conversations

Cheogram Android

but if developers and users agreed to focus on a stack — say, Matrix, XMPP, or both — couldn’t there a “Discord-like” ecosystem of compatible apps and communities?

Basically: could an open-source “Discord alternative” be built using Matrix or XMPP as the backend rather than trying to reinvent the wheel?

What are the technical or social barriers to doing that?