These are called “set phrases.” They popup every now and then in almost every language where one way of saying something just becomes more common than another perfectly valid way of saying it. There are likely a number of different factors that causes us to do this. One is that it can be easier to understand a phrase if you say it consistently the same way as people around you do. Another is that a can servative as a Shibboleth, something that helps you to recognize outsiders.
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