The biggest issue with Rust is its lack of mature UI frameworks. While several are being developed, they all have major shortcomings of one type or another, and

The biggest issue with Rust is its lack of mature UI frameworks. While several are being developed, they all have major shortcomings of one type or another, and if you want a more traditional "boring" retain-mode cross platform framework your options are even more limited. And as alluded to in my post, Rust isn't particularly pleasant to use for a UI use case anyway. Of course there is no cross-platform UI framework for Swift either, but if such a thing were to come into existence I think it'd quickly come to enjoy decent popularity for desktop application development.