Nonsense. He is not a super-aggressive shotmaker like a Shaw, but a player who is patient, plays a tactically sound game and employs the two way shot more than all but a few. His kicking is already solid, too, and he wins most of his tactical sequences, even against the most elite.
His safety game is already one of the best in the world (although I do understand that in Stage 2 of the US Open, he had two poor matches in defensive execution, although he made all the correct tactical decisions) and I believe he will one day be the best defensive player in the world.
I am genuinely shocked at those who don't feel Filler is already an extremely well-rounded player both offensively and defensively and invite them to watch him a little more often. His tactical choices are among the best you will ever see, and those who've been around the game a long time will see great similarities in his tactical approach to Pagulayan in his twenties.
He doesn't need more seasoning and he doesn't need more development. Once he has a little more experience, he will be the best in the world. I reckon it will take two more years.