This is quite a fact, most players follow a specific build just that many cannot really exactly follow the build with sufficient gears since those gears are usually overpriced and is quite hard to get.
This is just because the character gets the best output with those particular builds with specific gear builds.
To be specific with seeker, seekers just get the best damage on single targets(like bosses) with two dagger speed build with bunch of attack strength parameters. However to be like this, quite a lot of expert skills are being wasted.
I actually have thought of using 2h-sword(which has higher dmg, lower speed) putting skill points not at exerbation but to dmg skills like bloodthirst and etc with skill cooldown build. But in second thought this idea just doesn't really worth to try since seeker's expert dmg skills except bloodthirst do not get high dmg even if skill points are added...
To me I felt a bit boring of a seeker since it only uses auto attacks mostly. It almost does not spam any dmg skills since it even slows down auto attacks. This is quite 'monotonous' yeah, I really agree. However this is almost the best way for a seeker to be XD So I decided to go back to ranger..