[stacktrust]

From the docs:

  The aim is not to give you a full date picker, instead only the lower-level building blocks that allow you to build your own. You likely already have your own inputs, buttons, popover etc components. So why not use them?

[dotancohen]

Even still, choosing the year is a functionality issue (and potentially a UX issue), not a UI issue that is addressed by using one's own inputs, buttons, etc.