Thanks for the detailed response. I agree that Atanasov has the complete package. He seems to be the best well-rounded OH since Konstantinov‘s retirement one decade ago. It’s so rare to find a player from Bulgaria NT who is so strong at both attack and reception. He’s definitely crucial to the future of the NT.
With the increase in speed in volleyball and specialization in positions, all-around players have almost become extinct. It's rare to find such players in general, a combination of both qualities makes you a sought-after asset everywhere. However, I would slightly divert from your judgement here. Skrimov and Kaziyski are, to me, great all-around OHs. Kaziyski became a legend/emperor for his leadership, serve, and attack skills, but his reception is somehow overlooked.