Usability is certainly one of the most neglected security properties of almost every software. Jitsi is pretty dang good from a security standpoint, but fails miserably from a usability perspective. This is not an insurmountable problem. Even GPG4win has problems with user experience.
When people wonder out loud how something like Skype can dominate the market in spite of one of the worst security records, the answer is that they make it so easy to use that it becomes the obvious choice. People use it, like it, recommend it to friends. The network effect dominates software marketing. For projects with funding, there is no excuse for bad user experience. Failing to make graphics and usability a funding priority will absolutely make it harder to find and keep active users.
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