Just want to address the bold: that's why photos help. SL, APL, BSB, WL are all "estimates" not science and that's exactly what they are supposed to be. That we don't all agree on what's what is OK, because no one ever agrees on estimates. These so-called arbitrary measurements mean a lot to those of us who've never had long hair. Just being able to see the hair reach a part of your body it never reached before is a cause for celebration...and if we get past that...it's exciting to be able to see it reach the next zone determined by another "landmark". So maybe you may not care about this, but some of us do. And even if the distance is only an inch, it's an inch I never thought I'd ever see myself get past. And knowing it's an inch or six doesn't make me as excited as knowing my hair finally reached my shoulders. And I'm more concerned about getting to where I never thought I'd get not in how short or long a distance I traveled.*shrug*
That makes sense. I get excited to see my progress as well, no matter how it's measured.