Possibly because those guys are just scratching their itch and making what they need with as minimal effort as possible. I know, because I have been there with open source project of mine (of 4 people on the team, 3 were only focused on getting the features out and only one cared about UX and it was an uphill struggle for him to convince us to rewrite anything).
This is especially evident when you have no competition, no other open source project that solves the same problem. If you compare Audacity to other open source audio editors, you would actually appreciate that UX is functional and it's easy to understand what you are doing with it.
This is especially evident when you have no competition, no other open source project that solves the same problem. If you compare Audacity to other open source audio editors, you would actually appreciate that UX is functional and it's easy to understand what you are doing with it.