TV, Games Console, AV amp, streaming box. or as you say gives the option for HDMI over Cat6 if you wanted to move all the additional boxes to the network cab. That said a switch can often get you out of a hole if you haven't run enough
In one of my bedrooms there are two potential TV positions, so I have cables running to both, one set I have just left in the cavity to be utilised as and when I change the room configuration