it seems that all the chickens will be doing is digging around in their own poop. I can’t see how it’s beneficial to them.
I won't try to change your practices -- I included "distaste for the idea of manure accumulating" as one of the cons in my article and consider it a legitimate point of view. But I did want to point out that since Deep Bedding dries the manure out rapidly so that there can be no bacterial action and that Deep Litter neutralizes the manure by composting it the chickens aren't actually walking around in sewage.
Lazy I'll agree to. I have enough things that I have to do and enough things that I want to do that I set up systems to minimize the have-to's so that I can accomplish the want-to's.
No need to deep liter or use pine shavings for your run,
That depends on soil, climate, and local ecology (the other day I was coming back from the coop with eggs and got photos of a dung beetle busily rolling away a ball of chicken manure). Also the chickens per square foot density.
Some people manage just fine without litter in the run. Others have a smelly wasteland without litter.
My ladies seem to like having litter. When I dump a fresh pile of pine straw or lawn clippings they go nuts digging in it.