Gaming is the first geting adventage but there are others concerns for instance
1- integrated graphics use RAM memory, so geting a graphics card you will free your principal RAM
2- integrated graphics also take advantage of dual channel arquitecture,so it slow down your computer overall performance)
3- you also will get a more relaxed CPU, cause GPU will compute all related to multimedia (gaming,video editing,etc)
4- Besides there are some softwares that requires powerful GPU such as CAD or others 3D softwares, Remember HD4600 is still very very basic
in my opinion a graphics card is a very important part in PC, experience is the best teacher,so try geting a card and feel it