of course people will exploit the lower level bosses in this sytem. What if they threat level affected the likelihood of a rift? A party of 10s in Ydra, which can be yellow threat level, deserve the rift more than a party of 36s in Ydra (gray threat). Then the 36s will play in Shuyal.
I think the rationale behind bosses spawning rifts is to encourage people to complete the zones. So it would further that rationale to inspire them to complete zones of their own level.
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