I don't even consider myself all too casual and I still haven't downed Titan EX yet. Reasoning being, a) it's a lag check for everybody in the party, b) getting a party that gets it down, c) getting said party to schedule together.

Coil is pretty much the same, with the static I'm in having only recently gotten T1-4 down perfectly, but still struggling to clear T5. Lag, learning the fight, and getting organized are three seperate issues and they clash with progression. It's not up to me alone, it's up to 7 other people too.

I guess if you're lucky you get super-fantastic PUGs that nail this content easy-peasy. Or a solid group that often has time to play together, train together, and quickly takes this content down together. Or some combination thereof.

But bottom line there's nothing about this sort of content that allows it for "casual" players to clear it quickly, barring dumb luck or being carried.