A huge reason players would stop playing MO2 is the performance. AMD is greatly harmed by not being allowed to turn off shadows compared to Nvidia
Do you want you game to be appealing to more players? Or just those that who splurge on only new hardware. People with olderhardware are more likely to be interested in older games too. Just increasing your customerbase in a direction that is already prone to this type of game.
FPS affects your damage in game also hit reg is tied to FPS. Seeing a sword swing through a target because you had a frame stutter would leave a lot of beginning players uninstalling.