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The article is postulating only a theory. We have seen the opposite true in credit card forms where users have to input card expiry date. No matter what sort of

The article is postulating only a theory. We have seen the opposite true in credit card forms where users have to input card expiry date. No matter what sort of formatting we did, users always typed expiry wrong and our JS would point it out. We finally had to abandon input text boxes in favor of select boxes for card expiry month & year. We measured the eventual success rate and that turned out to be higher as well. My guess is that since the scope is so narrow (1 out of 12 choices for month) and selection is very obvious, perhaps people made lesser mistakes here. Select boxes are more effective in mobiles as typing takes more effort than tapping.

blacksmith_tb 10y ago
This is something that is badly implemented on many, many checkout forms, partly due to using selects/dropdowns (since they conceal how the choices are formatted), but mainly because an amazing number of sites seem to think it's reasonable to offer only January, February, March instead of the 01, 02, 03 that actually appear on all credit cards. This not only stops you from focusing that element and typing to choose it, but opens up the possibility the user will choose July for 06, for example.