I disagree. In a lot of cases text will be clickable, but will also contain content that you want to copy/paste into Wikipedia or a search engine etc. Think annotations (click on this text for more information) or headers/titles that are a proper noun that references something public... like a person's name or a place or a type of object or something.

I don't think that's an "exception." I think that's common enough to make me ask: "please don't make that text not selectable ever."