I, in the other hand, think creating that portal was a BAD idea.
Most spirits are pricks who don't give a damn about those puny short living apes .....except when we are messing with their holy forest/lake/shrine/favorite stuff. They simply cannot put themselves in the same shoes than a specie with the NEED of transforming their environment in order to survive. For them, we just cut forest and polute rivers for shit and giggles.
Heck, back in Wan era, when spirits ruled the land humans lived TERRIFIED, because the moment they step beyond the Lion Turtles back they got attacked and horribly mutated. Kicking them out of the material plane was the best thing ever!
AT BEST they are fair weather Friends, willing to tag along if everything goes fine. The moment shit hits the fan, let's say when a power hungry conqueror with momma issues comes knocking on the door of your city with a weapon of mass destruction, you can count spirits to abandon ship and leave you to deal with it.
Great, leave and don't come back you cowards.
P.E: special mention to Wan Shi Tong aka Owl Boomer. The guy who never stop pointing how humans are selfish, destructive, power hungry and never flush the toilet...while he keeps stealing human books and lore for his personal library.