The randomness of Boss mech can cause vuln you can't avoid?

[Malthir]

I mean, the dungeons are just "Harder" and mechanics happen faster, but you can avoid all of it.

for the Cactuar you just need to learn the mechanics there isn't really any randomness to it. you look for the cactus without flowers as its a smaller aoe. and for the others its mostly knowing what the boss does.
TLDR you can avoid everything.

No I get that that. I understand the mech, I'm saying when it overlaps with the expanding aoe attack the mob does, there is a random order to the placement of the cacti and a random order to the aoe's that the mob uses and it seems some times these two can end up with a config where you physically cannot avoid one of the two attacks, as in one of the the two cacti or sometimes both with out the flower are smack bang in the middle of the bosses aoe attack telegraph so you have to functionally be hit by one of the two attacks. That's what I mean.