Which part?

I know you're the creator of 4chan, and are necessarily going to see it "at its best", but surely even you must agree that many parts of it (especially /b/) behave badly?

Less anonymity = discussion tends towards staid, boring, repetitive, meaningless, dishonest, inoffensive

More anonymity = discussion tends towards thought provoking, creative, honest, offensive

That's a false correlation. There are many other boards on 4chan that are equally anonymous but have thriving and generally amicable communities.