Mumble is a tool with its own strengths and weaknesses. It's not a social communication platform, so of course it sucks to run a community on it!
What it is is an excellent voice server. I've used it for intercom at a large live event and it was perfect. I've seen it used at a large LAN gaming event to successfully cut bandwidth usage almost in half. It also has broad support for positional audio in games - something that Discord notably completely lacks.
It's free, it's open, it's not bound to provider-operated servers, it has stellar latency and is very extendable. Please, find me another option.
Simple convenience is the killer feature. Niches will use niche software
Convenience isn't a killer feature for us - it's the actual features. Positional audio simply isn't available on Discord and depending on what you're playing, might only be available via Mumble and nothing else.
It's a tool like and other with its own use-cases. It will never be the one and only communication platform and that's a good thing!
This is the kind of stupid elitism people have here. As if I haven't hosted Ventrilo, TeamSpeak, and Mumble servers for years. Maybe these days there isn't competition (although you mentioned TeamSpeak), but even back in the day it was a tiny miracle if two different groups actually shared a platform even inside the same game different groups/clans/guilds usually had different setups and I had to juggle multiple clients just to participate compared to now when everyone is simply on Discord.
Unless you need some niche feature (like the OP's positional audio) there simply is no reason to go for out dated client/server model.
Why do you know that?
Everyone is on Discord.
What security problems?
Element is the closest but the fact that it's paid already a huge turn off for a lot of users https://element.io/
I dont think it has voice rooms yet but hopefully one day.
I wouldn't say so, unstructured complaining really doesn't help at all. If the project has been around for a while then the flaws are usually well known. Before you lodge a complaint, you'll want to check the bug tracker to see if something has already been discussed. If it has, then the flaws have already been pointed out, and further complaining upon that point does nothing and only serves to annoy the people working on a fix -- the best thing to do there is to start contributing and collaborating on a fix to the issue. Then once you do that, you'll see why it's not helpful when people keep bothering you with "is it fixed yet" type comments :)
I think it might be a little uncharitable to say they prefer closed source software, it might be because it's often the easiest to access/use for a lot of people. I mean, that's been the struggle, no?
Security problems.
Barely maintained.
Some pretty major os bugs.
Most people can't get it to work first try.
I have to say, my game group uses it instead of guided or discord and it is genuinely annoying.