I think they mean in the sense that it’s not a native desktop app (or mobile)

I’d really really love for matrix to take off and to effectively replace discord, with continued development so things like stickers are supported in more clients, and to let servers be leaner.

However, if the friends and communities I want to talk to are all on discord, it’s hard to pioneer the alternative chat.

I’ll keep my matrix account and use it when I can, but discord will have to be on all my devices for the foreseeable future