Jitsi Meet and Matrix are missing system-wide/background push-to-talk (PTT) (to replace Discord).
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Tell Jitsi -> github.com/jitsi/jitsi-meet-electron/issues/210
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Tell Matrix -> github.com/element-hq/element-web/issues/15284
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Tell Element Call -> call.element.io (Settings > Feedback)
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Tell SimpleX -> github.com/simplex-chat/simplex-chat/issues/2398
Alternatives (obviously must be cross-platform end-to-end encrypted libre software)?
Jitsi, Matrix and SimpleX are cross-platform.