Just label it? or split it into 3 separate labeled fields? Obviously not one singular input without any explanations/labels. :/ (Seriously, what is the last time you encounter a text-based date input that is not clear on the format?)
Stop attacking the strawman. I am obviously talking about using text inputs as oppose to rolling selector/click to increment thingy (as shown in the article).
> Without user experience testing "I'm convinced" says more about the person saying it than the reality of what users in the broad will find easier and what will reduce friction.
The article clearly shows using the increment buttons/the rolling selector is causing problems for users. That is, my friend, user experience testing.