ELI5: How are the current dungeons hard?

[TDawnstar]

I don't see how reaction time is factored in here. You know the exact pattern of X/Os well before the first one even goes off, you know the order they are going off in. Additionally, you know the pacing of when the damage comes out unless it's your very first time seeing the boss.

Yes, and then you eat a vuln stack because for the server you are not in the same spot. Is it doable? Yes. But it's annoying as hell, and it stems not from the fight design but from how the client and server interact. A lot of other MMORPGs don't have that issue.