Most tanks are in a fine spot in the sense they're playable and function well. If you play casually they will all 100% service you well. You can still run pretty much any of them in EX/savage successfully.
There are just a fair number of people who either miss the DRK playstyle from Heavensward release or Stormblood, or felt like the version that came out in Shadowbringers has only been downgraded. Give it a whirl for yourself if you want to, because it's really not that hard to play when you know how to use your defensives right. I just personally find it very boring right now.
If you are worried about needing to rely on healers a bit more, then the other tanks might be more your speed, WAR especially for self-healing. GNB is better if you want faster play (and best damage, lol). PLD seems pretty sturdily built.
