Our area is similar to what Outdoor Girl wrote, but if the sellers are still in the house they are sometimes present. And in those cases, their agent is present too, which I like, because it provides a bit of buffer.
Before our house process got nasty, the seller was present at the septic inspection with my husband, and explained a bit about the surrounding area, the trees on the property and which one the bees like to nest in, history of some repairs, etc. It was nice to have extra information.
In our area, which is rural, there are many tests that are done, so I wouldn't expect the sellers to vacate their house every time. We have septic inspection, home inspection, sometimes a follow up to inspect any repairs, a radon gas test (dropping off then picking up the tester), and a well water test, although the sellers typically handle that one, so buyers only get results mailed. There's also an appraisal, and sometimes even a land survey - no buyers present for those, though.