That applies to when a choice must be made before the user can proceed, or when making once choice has an associated opportunity cost that prevents/discourages

That applies to when a choice must be made before the user can proceed, or when making once choice has an associated opportunity cost that prevents/discourages the user from making other choices. If the user is presented with sane defaults from the start and can also try toggling a checkbox in a settings UI to instantly test alternatives, the study does not apply.