Clojurians Log v2

At 1618 of this talk https://youtu.be/tiWTpp_DPIQ We seem him start two servers w/ different ports at once in the same thread (i assume), a purposed benefit of the lib. But couldn't you just spin up to a server per thread? Is there some benefit here people commonly take advantage of?

Really great talk btw, helped me a lot to understand the why.