Mostly easier for the keeper to be able to reach everything as needed, including the birds off the roost at night for exams. A taller coop is good for keeping ventilation way above their heads, more important for extreme temperature climates.I’m curious why a walk in coop would be better than an elevated coop that’s 5 ft tall? Everything I read about is based off floor space / roost space.
Here's some other tips on heights:
https://www.backyardchickens.com/articles/coop-stack-up-how-high-stuff-works-well.73427/
Can you add it to your profile as I described above?We’re actually in Oregon, but have very temperate weather in our valley.