Studying The Blade- The SAM DPS Guide

[Nominous]

Can someone explain why even the most top-tier SAMs aren't using Seigan very frequently?

The highest my Seigan has ever contributed, was 1.5% or so of my total damage dealt over a Susano clear. You can get 4 max per minute, if everything lines up absolutely perfect. But it probably won't, and I think that's why some people don't bother with it too much right now. It's worth it to have on your bar, for sure, you just have to really have the fight down to a perfect math to get the full 4 per minute.

I think if the proc window for being hit was longer than 5 seconds, it might be a little more 'approachable'. Right now, your rotation just might not line up well enough to pop Third-Eye as an oGCD in preparation of incoming damage. Sometimes, you might be able to line up the 5 second window well enough, but you'd rather press Kaiten at that exact moment since it would line up with your rotation better. That's why I'm not using it right now, anyway.