@igorsMistress Have you had diseases in your flock that made you go to these techniques?
As you well know I suspect my flock had Marek's. Since I had to cull the entire older flock, I did change my routine...vacuuming the dust out rather than sweeping to the floor since Marek's is shed in dander, and sanitizing the coop once a year.
As I said, what works does, until it doesn't.