In regards to making PLD as an OT more engaging, make sure to use your tools and specifically Intervention. It is astounding how rarely I ever see a PLD OT actually use Intervention.
As a PLD you only have two uses for your Oath gauge, Sheltron which does little good as an OT and Intervention which you can use on the MT and help out by lessening damage taken. If you are just sitting on your Oath as OT and aren't using Intervention, you are not playing PLD to it's fullest and will likely not find PLD interesting.
Also, I have noticed a distinct rise recently in people saying that "active mitigation" is the solution to making tanks more fun to play. I really think people need to be more specific about what they are talking about in regards to this because I see many people throw this term around far too generally and at times just straight up incorrectly.
Active mitigation is mitigation/defense that you actively engage, like a defensive ability that you press a button to engage when needed.
Passive mitigation is mitigation/defense that exists passively within an ability or state, for example the 20% mitigation that you get from Shield Oath or Grit is passive mitigation. One could also define the self-healing from attack abilities that are used as part of regular attack rotations, such as Storm's Path, as a form of passive mitigation.
So by definition many of the defensive aspects and abilities of tanks in FF14 are in fact active mitigation.
Now if we factor in the more recent vernacular of active mitigation which describes active mitigation as being abilities that are used more frequently but have a very short duration, that have to be timed more precisely to defend against telegraphed or timed hard-hitting attacks (tankbusters); FF14 also has those as well in the form of TBN, Sheltron and Inner Beast.
So let's please avoid just saying "we need more active mitigation" and actually present more thought out and detailed ideas and solutions.