Disruptive Frontline Gameplay

[Scintilla]

Many people make the claim that the DRK combo is very easy to pull off and requires no skill, so why doesn't everyone do it then? Have you ever seen a bad DRK+AST group? I've seen many, they feed the enemy team a lot because they think they're meta and invincible.

A lot of people are doing it - hence this thread. Just because there are system weakness that are exploited by some, it doesn't mean that it should be an obligation for all players to form a premade team of their own solely just to be able to have a remotely competitive game.

As for how to combat this combo when the pre-made is actually good? There is one way that almost always works.

Firstly, you are somewhat assuming this to be a purely DRK/AST/AST/AST team. I haven't come across any such teams myself so I couldn't comment on how effective they are or their playstyle.
I have had a few experiences with DRK/SMN premades but, whilst annoying, these weren't immensely effective - mark the DRK, make a call reminding others to use Guard, and then focus down the weaker SMNs wherever possible. It was a nuisance, sure. But workable. My main experiences though have been DRK/DRG/DRG/RPR premades. This is not so straightforward. Guard is now effectively useless, focusing down a BH5 DRG is going to take far longer to do and Elusive Jump is invaluable in making their escape, RPR similarly has it's teleport to make a quick exit.

This also requires the premade to be focused on attacking the other random team whilst your own random team comes in for the attack. As said countless times already - this requires both random teams to make a silent alliance to focus down this premade together. While they're attacking one random team, the other comes to support them and kill the premade, and vice versa. This would need to be done repeatedly throughout the entire match to keep their BH down - just doing it once or twice might hit the reset button (assuming you do actually kill them all), but they'll quickly pick up that BH again the moment you stop. Objectives become totally ignored and/or given to whichever random team is currently in second place to keep them in the game.
This also somewhat relies on the outlook of both random teams being the same. A joint alliance. It only takes a single random team to try to take advantage of the premade, perhaps by leaving the other team to fight them alone ("let them fight, just focus on objectives and we win") or by trying to farm the other random team to steal free kills, and the whole system breaks apart with the premade getting a guaranteed win. Fortunately, as time passes and more and more players become aware of premades, teamwork between the two random alliances is becoming a little more common, but it's still by no means the majority.