Very few people use pure dirt because of the poop dust issue.
There are a lot of people who use sand and do daily scooping but most of the ones who are happy with that system over the long term live in dry climates.
If I let my run go to just dirt it would certainly reek in short order...
I use deep litter in my run when it doesn't have grass in it (wet summer has resulted in a surprising amount of grass remaining).
Pure dirt would soon be pure poop dust without litter to compost it.