I am always interested when people make the argument that learning something new will make you more productive, efficient, or valuable than using old technology without any qualification on the type of project being developed. We have been developing a project in winform for seven years. We looked at doing the next version of the project in WPF and after months of development concluded that there would be a negative ROI based on the type of project we were developing. Maybe XAML / WPF is valuable on some projects, but not ours! So quit making claims without qualifying the type of development. I would really like to have discussions on what type of development projects WPF/XAML work BEST. And what changes could be made to WPF to make it better for more types of projects.