Why on earth would you set the fps cap to 120?

What is the actual point in setting a CAP on FPS??? I have a high end computer for a reason why am I going to be capped without my decision? Why do devs make all the decisions for us? Is this supposed to be a good change? This will make playing nurse (as I am a nurse main) really gross to play. 120fps isn't bad, but compared to my 165fps I usually get, this will be disgusting.

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