My only problem with the cliche of “Everyone does x differently” is that it fits intuition and people can relate to it - thus, it’s popularity. More often than not, it is not scientifically backed. It also robs away attention and understanding when things are truly different for one another.
Perhaps a more accurate statement would be "people prefer to learn things differently." Such data can easily be gathered by polling and is non-controvertible. Preference in learning methods is different from the relative effectiveness of them.
Some people like fast-food hamburgers; some like them from expensive restaurants; others like to cook them at home. But nutritionally, they're not all that different from one another.