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I would say Discord is missing 2 crucial features that prevent it from replacing old software like IRC for large chat communities.

1) offline mode

2) different names for each server

No linux support either, sadly. The linux client has apparently been due "Real Soon Now" for nearly a year.

i've been using https://github.com/XNBlank/discord-linux for a while now, and it works quite well.

Offline mode?

The ability to appear as offline or at least away. It is a feature present in almost every modern chat application.