In practice today, that's fine. Typically authors have a hard time differentiating what "emphasis," "importance," and "bring attention to" mean to them. Therefore, nothing conveys a distinction by default.
So then what's the point of making this distinction? I would like to see surveys of how many people actually author content in forms that differentiate between b and strong.
So then what's the point of making this distinction? I would like to see surveys of how many people actually author content in forms that differentiate between b and strong.