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I don’t know about discord issues, the hype behind is it mostly that it’s free, very convenient, feature rich and can easily integrate bots. Its the go-to place to build communities nowadays.
Matrix issues that I read about can be seen here https://telegra.ph/why-not-matrix-08-07 . I haven’t done my own research tho so I don’t know if all of this is (still) true
Lemmy is a public forum, discord servers are usually for invite-only, more closed-off communities, and we’re not talking about a lemmy replacement but rather how this is inadequate as a discord replacement.