Did you miss the tiny little part of having
no controllers? If you want to play some trivial games via tapping with fingers around for sure, but nothing sophisticated can be done. Whole UI is done for browsing and mimicking big screen and reading text.
Unless you mean holding mouse and keyboard, while sitting behind desk. For 1/5th of the price you can just buy big gaming curved screen which has many many technologies that help gaming experience, and Apple will have 0 (ie gsync/freesync, antiflickering etc.).