I'm left handed and use the right hand for the mouse. I can also use it just fine with the left hand but see no benefit. And yeah, writing is a different story

I'm left handed and use the right hand for the mouse. I can also use it just fine with the left hand but see no benefit. And yeah, writing is a different story entirely, although as another bizarre anecdote, I can write text on the chalkboard pretty much equally as well with my left and right.