I played XI with a controller, which worked great. I never considered kb/mouse an option in that game. I started XIV using a controller, after a few weeks I bought a steel series merc keyboard and have never looked back. I had originally switched because targeting was absolutely atrocious prior to 1.18, and was able to create dual layered macro for targeting which still works way better than any of the targeting options SE has added since. (I created a /targetnpc macro that I can initiate with a single button press on my keyboard.)