What would you recommend for someone who a) wants to see something as small as mushroom spores, and b) would like to take decent quality pictures of them? DSLR or smartphone mount if there's one that's not super fiddly?
I'm an astrophotography nut, but I can see where imaging with a telescope has similar issues/hurdles as imaging with a microscope. There are mounts that allow you to position a smartphone on the exit pupil of an eye piece of a telescope so that you get the benefits of the magnification of the eye piece. I can only imagine that there are similar for microscopes as well.
As for using a DSLR with the microscope, I'm guessing it might have similar issues as astronomy. When attaching the camera to the telescope (possibly same for microscope), you lose the magnification of the eye pieces. The image data is hitting the tiny tiny pixels of the DSLR so that the scale of things will be very small in your high megapixel image. This is why so many people prefer lower resolution cameras as the pixel sizes on the sensor are much larger. Just based on experience with optics, I'd imagine this would hold true to microscopes as well.
