In my example, I didn't understand why I wasn't getting blueprints for new weapons. I thought that, like in many games, they were randomly dropped by bosses. I also used a promo code for blueprints, but I didn't receive them either. This was due to the obscure mechanics of obtaining them through track.
#Add a hint to the mechanics of obtaining blueprints.
slate mantle
solemn grail
I agree with adding a tutorial of some kind to the blueprint system