Anatomy was glossed over in your YTT. At the time, you figured it was fine, you didn't really need it, you know the asanas well enough.
But then a colleague mentions the frontal plane and you nod along then rush home to look it up again. And that time you took an advanced training and they discussed poses that work the lateral side body and you froze thinking "what are they talking about?"
I'm a bit embarrassed to admit this was me (hello, I also have a biology degree) but anatomy just never quite landed for me before. Then I decided instead of suffering in silence and feeling doomed to never understand I'd create something that WORKED!