Why is building a UI in Rust so hard?

Rust's unique memory management model and lack of inheritance make traditional techniques to build a UI framework difficult. However, the language's strong commitments to portability and performance, as well as its active ecosystem, make it a compelling choice for UI programming. Currently, there isn't a clear one-size-fits-all UI framework solution in Rust, but various approaches like Elm architecture, Entity-Component-System (ECS), immediate mode GUI, or even using the DOM to render while keeping application logic in Rust are being explored by developers.