Except that for free software, "the person writing it" is not preventing anyone else from being "the person writing it" so anyone with criticisms is directed to apply time or money to solving the problem they're complaining about. Because unlike proprietary software, you can actually do that.
This doesn't work well for UI improvements for a very specific reason, which is that most of the UI criticisms of free software are about how it's difficult to learn rather than how it's difficult to use after you've learned it. So by the time you've spent the effort to learn the existing UI well enough to know what changes to make to it, you no longer have a personal incentive to make it easier to learn, because you've already paid the time cost of learning it.
But that isn't user-hostile, it's newbie-hostile, which is different. In particular it means that if you're willing to put in the time to get over the hump, you end up with software that actually does exactly what you want, even if the incantations to get it to do that aren't always initially intuitive.
This doesn't work well for UI improvements for a very specific reason, which is that most of the UI criticisms of free software are about how it's difficult to learn rather than how it's difficult to use after you've learned it. So by the time you've spent the effort to learn the existing UI well enough to know what changes to make to it, you no longer have a personal incentive to make it easier to learn, because you've already paid the time cost of learning it.
But that isn't user-hostile, it's newbie-hostile, which is different. In particular it means that if you're willing to put in the time to get over the hump, you end up with software that actually does exactly what you want, even if the incantations to get it to do that aren't always initially intuitive.