Vast majority of text fields I see are coded values that are perfectly fine using ascii, but I deal mostly with English language systems.
Text fields that users can type into directly especially multiline tend to need unicode but they are far fewer.
English has plenty of Unicode — claiming otherwise is such a cliché…
Unicode is a requirement everywhere human language is used, from Earth to the Boöotes Void.
Some examples of coded fields that may be known to be ascii: order name, department code, business title, cost center, location id, preferred language, account type…