I came here to suggest the same thing. Especially when searching for linked records to match, it’s very easy to forget or not have the ability to type an accented character when looking for an accented record.
In Postgres, for example, there is an unaccent function that is very commonly used when searching from text inputs, that strips diacritics/accents down to regular ascii characters. This improves the ability of search to find the records you’re looking for.
I’d love to see Airtable gain this search improvement as it would greatly aid record linking.
I’ve recently come up against an issue with umlauts and the new REGEX_MATCH formula. An unaccent function would solve the issue I’m having so it’s a vote from me too