Well, seeing as he is talking about WoW here....we all know WoW has trouble even maintaining 60 FPS in CPU bound situations. So yeah, 144 FPS is pretty hard to achieve. Also, a 1060 is not gonna push 144 FPS in most current games at Ultra Settings:
https://www.techpowerup.com/reviews/...0_Armor/6.html
https://www.techpowerup.com/reviews/...0_Armor/7.html
https://www.techpowerup.com/reviews/...0_Armor/8.html
https://www.techpowerup.com/reviews/...0_Armor/9.html
https://www.techpowerup.com/reviews/..._Armor/10.html
Should I keep going? Nah, you can go through the list yourself. I'll summarize for you though, no game they tested got more than 144FPS at 1080p with the 1060. Quite a few did not even break 60FPS. So yeah, with his set-up, it more than likely would entirely solve the screen tearing issue. In addition, if it did not, if he was pushing more than 144FPS in anything, he could just turn on render scale and adjust it as needed until he gets just below 144FPS.
On to the OP though. That gave me an idea. Why not just turn on render scale? Should force your FPS below 60 and problem solved.
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It work differently, not sure of the details on that though. It might work better, might not.