Why would you waste precious slots in your 4 man party with anti DRK roles? As said above, making your own DRK premade is way more efficient and safe and I don't know why would someone waste their time trying to counter premades, especially when there is multiple running at once, you're not gonna counter them all.
The problem with anti DRK comps or even solo jobs like MNK is that they rely on non premades to take on the mantle and do it.
First, the effort required to disable a DRK premade is higher in the tenfold, because it requires way more pinpoint accuracy than the premade you're trying to counter: since if you disable the DRK too early, they can just laugh in your face and go at it again once they made mince meat out of you, or if you do it too late the DRK already jumped in and did their thing, which makes anything you're about to do just too late. Sometimes you meteodrive/punt the DRK away and you're like "yay I did it I prevented their combo!" except that once the DRK recovers 5s later, it's not like the fight is already gone elsehwere anyway and they'll just shrug it off and go back at it (and laugh in your face while doing it).
Second, you don't need a DRK to flatten a team, I've done it with a single DNC + PLD, if your team is following, so they can do it with whatever 3 remaining jobs they do have, but granted the DRK is the corner stone to it so going for it is what makes sense.
Third, playing counter is not fun for most people including me: I'd rather play MNK or other counters to directly delete the BH5 players individually when caught pants down instead of suiciding head first into a premade stack or two when my chances do actually get a result out of it are all but guaranteed.
