Lag is definitely existent. I usually noticed it a couple of weeks ago every evening from 7-10pm GMT. One time this was happening, we were running Stone Vigil and we wiped on the final boss 4 times because NOBODY was able to evade the AOEs even though everybody had done the boss multiple times before. Everybody in the party could clearly see that everybody else was timing it right and getting out of the way well before the AOE should register but still getting hit.

This dragged on until after 10pm and bam, the lag wave subsided. We succeeded immediately on the 6th try.

Lately it hasn't been so bad. In about 95% of the cases when I play, I am sure that is my fault when I get hit by AOEs. But there are situations when I have to call BS; where I basically know I'm about to get targeted by an AOE, already start moving in advance like a psychic, and STILL get hit even if I use sprint.

People wouldn't complain if they weren't taking this despite having a good internet speed/connection.

"fix server-side lag issues" and "make the game easier" are two completely different things.