I got this software update pop-up on my Mac today which is pasted below. Seriously why do I need to restart the whole OS to update an already installed browser?

I got this software update pop-up on my Mac today which is pasted below. Seriously why do I need to restart the whole OS to update an already installed browser?

At VendAsta we have had big time problems with Dell XPS machines that we had bought. Gradually, we replaced all of them with Mac Book Pro’s. Somebody, by accident, put the Dell XPS machines at their rightful place.