Agreed. I think the Mumble project is awesome for what it is, but it's always never had the same design goals and simply doesn't have the ease of use (whether through lack of capacity/will or through it's server-based structure versus Discord's centralized server platform) of Discord.

Where I think Mumble particularly shined was being one of the first to broadly introduce the Opus codec which really set low latency communications into play. Mumble was really a champion in this space.

I find it hard to believe that Discord, in its design, didn't evaluate its competitors at one point and decide to follow Mumble in implementing Opus.