spamming flash?

[Sephirah]

yes or no, and why?

Yes AND No

Use Flash/Circle of Scorn
Flash is not good enough to hold threat on it's own, but it isn't negligible. Using Circle of Scorn/Flash after a Shield Lob with CoS being off GCD is a great way to start AoE pulls. I view Flash as an extension, it's not going to generate a substantial amount of threat, but it's enough to hold something as long as it isn't being focused or heavily AoE'd.

Cycle target/attack to monitor/hold threat on multiple enemies
As mentioned previously, Flash is not enough to hold AoE threat if all the enemies are being attacked by AoE. You will still need to use Flash, but also rotate between your targets to monitor their threat. Fast Blade > Savage Blade > And Rage of Halone will stay combo'd when you switch targets, and using Circle of Scorn/Flash will not break their chain either. So rotate between your targets, and use a combo'd Rage of Halone on anything you're about to lose threat on. This can take a lot of focus when dealing with 3 or more enemies, but pretty fun when you get the hang of it.

Just copied these from my 10 steps to being a bad pld thread, there are also several others that go into why you should be using flash. http://forum.square-enix.com/ffxiv/t...eing-a-bad-PLD

There are also specific fights where it is needed more than others, Turn 4 for example, you definitely need to use Flash a lot if you're the OT.