Why most pros use 120fps cap instead of 144, and net prediction?

^ title. If i can reach 144 fps stable, why would i want 120 cap? I've read somewhere that's related with Syndra movements... Also net prediction should make everything feel worse, am i right? I ping 40 ms usually. EDIT: you guys didn't get the point of the question. I have 144 STABLE 24/7. Why would i want 120 in this case?
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