I do both design and development and in my experience it comes to abstraction level, control and code quality. Any GUI editor I've tried sooner or later comes

I do both design and development and in my experience it comes to abstraction level, control and code quality. Any GUI editor I've tried sooner or later comes down to editing CSS/ HTML via dialogs which is less efficient than editing text files and requires similar expertise. I'd rather know CSS / HTML than be an expert in my way around a certain GUI. Front-end code structure matters a lot for maintainability and there is no standardization to account for that. Autogenerated code is not great. So, once I am done with basic UX prototyping on paper, I usually move to handcrafted code and fill in detail as I know/discover more, testing along the way.