I just had to pop into this discussion! IMHO, having only used Sweet pdz for about 2 months... I use it only on the poop board in the main coop.
There are no chicks walking or rolling around taking dust baths in the stuff. My chicks are in a separate smaller coop with pine shavings. If I had chicks in the coop then I would still have them in an area where they wouldn't have access to the poop board.
My chooks never go to roost until the sun goes down. I spy on them all the time with a Nest cam which comes in handy for different things.
Sweet pdz helped me recognize that something was wrong with my chooks almost 2 weeks before any other symptoms were noticeable. I didn't know what it meant at the time, but now I do know what to look for. If they had been on the old roosts which had no board underneath, and only the straw bedding on the floor, I would not have seen it for some time. This was about as clear as could be.
I have started to wear a mask when I scoop it out, and I try to do it daily, never leave it for more than 2 days.
The only error that I made was that I made the board too deep- there are 2 roosts over it. I'm vertically challenged and have issues with my shoulder so scooping is not always comfortable. In a couple of weeks I am changing the setup so that the roosts are in an l shaped configurattion and the board won't be so wide!