Yes, it should absolutely be optional. And I had no idea how it worked until I tried PvP but was instantly captivated by the possibility of using it in PvE.

I'm a reasonably experienced player... but I have clumsy hands, and freaking ADHD, and I can get distracted in the middle of combos. But just having my hands physically in the same position for a combo I'm already going to do in the same way every time just makes sense. What is the big difference between pressing 2, 3, and 4 on my keyboard, and pressing 2 three times?