I would not oven-dry it. About the only reason to do that would be to sterilize the material. One might need sterile material to germinate spores or perhaps orchid seeds, but as you say, those beneficial organisms are a plus, not a negative.
Here's a funny story, at least I got a laugh out of it. I told the story last year on another post, so if you have already read it, I apologize for posting it again.
Summer before last, I shipped a couple of small fiddle leaf ficus plants to a nice lady in New York (the city). Those ship bare-root but there is a good bit of soil that accompanies those bare-rooted plants. As many now know, I keep all my tropical plants under large oak and cedar trees from April through October. The orchids are up in the trees and the terrestrials are sitting on platforms under the trees.
Anyway, the lady sent me an email after she had received the fiddles and said she found a horrible pest in one of those root-balls. She said she donned gloves and "pulled" the rascal out of the soil and flushed it down the toilet. She wasn't mad or anything - she just wanted me to know. I asked her to describe the "pest" so that I would know what it was. Her description (which was hilarious to say the least) perfectly described a red wriggler worm. SHE HAD NEVER SEEN A RED WRIGGLER! I "carefully" explained that the worm was beneficial and not a pest at all. I further explained that those worms would only live in good soil, so when you found them, that indicated that the soil was "healthy". I told her never, ever flush another one. Her last statement to me was that she understood what I said but feared that the worm would "escape" (her words) and crawl into her bed or something. She said if she found another one, she would flush it.
I kid you not!
Actually, this lady bought several more plants from me over the last two years but never found another worm. I was always extra-careful to examine any soil that accompanied the plants that I sent her.
Who says my business is boring?
I am drying the latest batch on trays as we speak and I'll send as soon as I feel it's ready to be bagged up. 
They probably think their beef comes from the grocery store. 
This lady in New York City (I think you folks up there just call it "The City") lives in a high rise, in something I think is called a "flat" (whatever that is), and probably has never dug in real dirt. I know all her plants are either potted or mounted and that her potting soil was probably sterile. 
