> You can usually click the year and then pick that first.

Even then, clicking the year will often lead to a tiny one-page list of 10 years, which you can either page back in or click the decade to get shown a list of decades to pick from. So: click 2026, click 2020s, click 19XXs, click a year, click a month, click a birthday.

Such an interface makes at least some sense for "pick a date in the near future". When I'm booking an airline flight, I usually appreciate having a calendar interface that lets me pick a range for the departure and return dates. But it makes no sense for a birthday.