Sure it's your choice to click.
It's also your choice to drive 10 km under the speed limit, no on will force you to do the limit, but should you choose to you will arrive at your destination more quickly.
It's your choice to drink water over gatorade, and both will hydrate you; but only one replaces lost salts and electrolytes.
Honestly, the downsides to clicking are:
-cursor travel time between icons means you activation time between abilities is longer, also it means you can't button mash until the GCD is done. Which means your likely waiting to see the GCD finish.
-If your looking at your cursor and the icon, your not looking at the game screen, you could miss something!
-Your likely using your keyboard to turn, which is substantially slower then using your mouse.
-If your using your mouse your likely to be tab targeting which means your essentially scrolling through target rather then selecting them directly.
These are all real disadvantages to clicking; you may be a great player clicking, you'd be a god keybinding. It's simply faster, more accurate, and allows you to multi-task better.
Become a better player, don't just defend the status quo without realizing you really are performing sub-optimally. Name one advantage of clicking?
Name one advantage of clicking?