One fo the feature parity items is the ability to select a month and year in the date picker. Sure, you can use the arrows to traverse per month and year but that can be annoying. Classic allows the ability to click on the month/year in the title bar to show a selector to choose a month and year and that what this Cmd package does for modern: https://github.com/mitchellsimoens/extjs-date-picker

screenshot.png