Very good article!As @Ted Brown said, there is a difference between Deep Bedding and Deep Litter.
Here is my article on Deep Bedding: https://www.backyardchickens.com/articles/using-deep-bedding-in-a-small-coop.76343/
Both are low-maintenance if done correctly and both are problems if you have too many chickens for the amount of bedding/litter, poor ventilation, etc. My article discusses pros and cons.