No need to apologize! We're just trying to understand what you're asking.
As far as soft caps go, the only one that might have a soft cap is Skill Speed. PLD and DRK right now don't have any ability to recover TP in tank stance outside of MP-spam, which is only so effective. Skill Speed makes TP burn happen more quickly, which can make you floor your TP sooner. You might not see it in dungeons, but it will come up in longer fights (especially Savage encounters). But there is technically no soft cap that you can really reach to cause a stat to no longer be useful. Crit will keep making you Crit more and more often, SkS will make your attacks faster and shorten your GCD, and Det will amplify your abilities at a flat rate.