I've seen the Onsal cheese a few times, but it's not 100% effective i.e. it's still not enough to carry an entire team that isn't trying to win. Countering premades is simply a whole different beast. That SCH squad from Zalera were able to DoT everyone to death because they had better support.

On a more surprising note, it seems PLDs are also cheesing Fields of Glory now. We encountered a four-man premade (only two from Zalera though) that, instead of going after ice, would just hang around an enemy base and combine the absurd mitigation from Phalanx and Guard with Guardian and Elixirs to heal, to the point where ~10 distracted people couldn't deal enough damage to burn one of them down. After a couple losses, I just switched to SAM and Zan'd one of them, but they managed to lose that match anyway. Probably because the matchmaking RNG wasn't in their favor that time.

With that said, they do still need to consider changing Guardian so it doesn't prevent interruptions. The fact that PVP Cover is so great while the PVE version isn't is bizarre.