Do humans / animals require viruses like we require bacteria to function?
There may be viruses and funghi operating in the same way beneficial (even critical) bacteria do. But, because research into and understanding of the microbiome is still comparatively in its infancy, we may be unaware. IIRC, my professor mentioned that the current ways we examine microbiome may favor the understanding of the components which are amenable to testing (meaning, we take a stool sample which shows use the bacteria living in the lower intestine well, but other components like other bacteria/viruses/funghi living further up the digestive tract we can't understand/sample well).
I had an idea like what if you could have a time release pill that opened up, sampled, and closed various compartments at various times throughout the tract. idk if it's doable or if that idea is unoriginal, but I think it'd be informative to have.