It's a long article, but there's actually a section called "Where Does This Leave An OS’ Native Date Picker?" That links to exactly what you've linked here, and

It's a long article, but there's actually a section called "Where Does This Leave An OS’ Native Date Picker?" That links to exactly what you've linked here, and describes some considerations for when you might not want to use them: "The problem with native date pickers is that they are very limited in their design and functionality. For example, it’s impossible to add any details such as availability or pricing to a native date picker to avoid zero-results pages. It’s also impossible to select a date range and highlight the connection between two dates because it doesn’t provide a calendar overview." I think the title is a bit misleading, it sounds like they're going to design the perfect date-picker widget, but instead it's a giant catalog of design considerations that vary for different reasons for requiring date input. Basically, you probably don't want a one-size fits all picker, you'll want to adapt it to your particular problem domain