You do you, and I have nothing against it, and sometimes I would even recommend you to try something like Hekili if you are new to the class or to the game in general. It might even help, who knows.
In reality, I am against performance enhancing addons (I wish for Blizzard to finally include the features they represent in the basic interface and also update the visuals of their fights), but Hekili isn’t one of those, it’s just a learning tool. And an especially well made at that!