To kb:
It is indeed arguable we don't need this page. After all, we don't have [gote thickness] or [gote territory]. But on the other hand, it is an often occurring result of a life and death problem, moreover one which can be overestimated in value.
Also, there is hardly any duplicate content involved. It refers to gote and seki.
We don't really gain much with this page, but it doesn't clutter up SL either.
And, unlike gote thickness or gote territory, sente seki and gote seki actually appear in the go literature. They are real go terminology. :)