I'm in the same boat. I have DT880, D7000, and AD900. I've heard the HE series and they're awesome, but unless I get at least HE5xx, it's somewhat of a small upgrade and more of a lateral move to a different tech.
What a shit paper. Any actual researcher would rip this paper apart for their shoddy methodologies, the dubious references, and their misguided conclusion.
Are you talking about Google? If so, then you're absolutely wrong. Google has had machine learning specialists (i.e. data scientists) in their employment since forever. Besides the advancement of their search engine algorithms, one of the main uses for machine learning is automatic...
You're right. It really just comes down to fluidity vs resolutions which means it really comes down to your games. If you play mostly single player or coop games, then go 4k. If you game via competitive multiplayer games, then go 144hz.
I am also a big fan of HSU. Such clean, but loud bass! Also, the bigger Outlaw subwoofers were designed by Dr. HSU so you will get a very similar sound between the two brands. I have the HSU and I got my friend an Outlaw. I can attest to the similarity.