Speycasting should always be evolving. There are new things to learn despite the lull in creativity that we see now. My mentors were guys like Mike Kinney, AL Buhr, Marlow, Aaron Reimer, and even Heinrich Mortenson focusing on short heads. They are all valuable tools to add to one's repritore of casts to use. Even Ed Ward opened my eyes to his Skagit style of casting which was graceful and enjoyable to watch when Ed did it. Not so enjoyable when the countless Skagit experts hacked it to pieces and it became a marketing scheme with zero talent involved. Obviously my opinion on this and no shits given if you disagree your free to.
The evolution of a speycaster use to be to learn all the different styles, from short heads to long lines and be able to use those tools to fish every situation one could find on any river in the world. To be able to do them all equally was considered casting at a very high level. Not a master because no one masters speycasting it should always be evolving and impossible to truly master in a life time. Keep it real, keep it new, keep a smile on your face, celebrate that fish you hook on the perfect cast. Be humble!