These are different letters for people who speak the language and treating them the same in some usage seems weird. At the same time, sometimes words containin

These are different letters for people who speak the language and treating them the same in some usage seems weird. At the same time, sometimes words containing those letters might show up in context where the user is not familiar with that language. Such users might not know how to enter those letters. They might not even have the capability to type those letters with their installed keyboard layouts. If they are searching for content that contains such letters (e.g. a first name), normalizing them to the visually-closest ASCII is a sensible choice, even if it makes no sense to the speakers of the language. It's important to understand a situation from different perspectives. It's not about coming up with a single correct interpretation that makes logical sense. It about making a system work in least-surprising ways to all classes of users.