Is it okay? Why certainly. Against common belief, it is perfectly acceptable to not like and even not engage in a certain playstyle, whether that be big pulls, small pulls, whether it's DPSing as healer or not, whether it's using fire spells as Black Mage or not, whether it's using Mudras as ninja or not, whether it's using AoE or not... whatever.
The keypoint is always to ensure that your group will be fine with your playstyle before you queue up.
If you fail to do that and play with randoms in duty finder, please adjust your playstyle to the group. Whatever that playstyle may be.
That said, of course there's limitations, the most notable one for big pulls being gear. You can't pull more than you and the healer can take. Gauging that will come with experience. Likewise, you'll become better as you practice - they're not actually that hard, though they did get somewhat more complex for DRK with Stormblood. The gist is always the same, though: Gather up the mobs with AoE enmity moves and rotate your CDs for mitigation. Keep using AoE afterward insofar resources allow.
It's not rocket science, the hard part is gauging just how much you can take and there's no good way to learn that other than practice. And if you simply categorically refuse to learn and do it ever -> PF is that way. No harm done.