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It's primarily an issue of fecal/dander contamination. The closer the food is to the ground, the more likely it is to come into contact with environmental dust generated from the more or less strictly terrestrial activities like rake scratching and bill digging. Dander is of course largely deposited from nocturnal perches. Adding feed particulates to that mix is enhancing the environment for potentially deleterious bacterium.
Secondly, a feeding table helps make an enclosure more complex- more behaviorally stimulating while also obliging hens into more activity-
Birds breath through their bones to some extent and the more activity they have ( above the heavier dust layer ) the better.
Another challenge that leads me to this solution is my own ergonomic issues- namely- I know that I've got to keep these feeding areas clean enough for my family to eat off of.
If I have to bend down all the time I may get lazy from time to time (nevermind when you leave these chores to someone else with less conviction or concept). If I'm not looking directly at the waterers I may not appreciate how filthy they've become.
On that note, I find that any health problems are more immediately recognizable when the birds have to fly or jump up to a feeding station. I'm looking directly at them at waist or eye level-rather than looming over them.
You may find as well that territories are not so well demarcated on feeding tables as chickens tend to be more territorial over ground space than mid elevation tables and high elevation roosts.
Lastly, a feeding table creates more physical space, that is, the surface area that the birds can actually use- this basically increases the % of room the birds have to live in- something particularly useful during long winter months.