So, I'm in the USA, looking to teach my kids Latin, and casting about at different programs. What I'm noticing is that most, if not all, elementary-age Latin books (I'm talking about, say, third grade level) omit macrons, whereas high-school and college-level texts generally include them. I find that bizarre, since macrons are a significant aid to the student. Why would textbook authors for young children leave them out?
[EDIT] I've now seen a few that include them, but still quite a few that don't. It is a mystery to me.