Good point. I don't see the issue with a new syntax either. GUI libraries always come with their own set of large APIs and conventions, so learning a new syntax

Good point. I don't see the issue with a new syntax either. GUI libraries always come with their own set of large APIs and conventions, so learning a new syntax isn't a big deal. The special tooling and dev environment in Slint are optional. But if you do use them, the Language Server Protocol (LSP) allow to integrate them everywhere and provides handy features like code completion, navigation, and even a live preview.