I dont know, but i think there is a severe lack of understanding on what blood-sucking mites are and how they look like, and also about harmless springtails and harmless mites.

I think the way to sort it out is by using photography. Please share microphotography that shows either harmless or harmful insects in detail here. With a few really nice images of the bad guys, and a few really nice images of the good guys, we will have a reference that lasts. I will try to contribute.

Best Regards, and, why not?