Whether somebody chooses between healing and DPS is not down to the complexity of your DPS kit. It's down to the content and how effects your healing tools handle it.
It's why playing as a Blue Mage healer is more engaging. It's less efficient at healing and despite you having a bigger DPS kit? You are DPSing less because you have to focus on your heals more.
And healing jobs have always had non-healing options in just about every RPG I can think of that has a healer, simply because there's periods of time people don't need healing and the healer still needs a purpose.