Agrees that sand is not a good bedding substrate in large quantities.
Use it mixed with PDZ in the brooder.
Sand and poop make 'cement' that sticks to chicks feet and especially their toenails.
Yes, easy to scoop poop but hard to get it all, eventually it became saturated with Pulverized Poop. I did try 'washing' it couldn't get all the PP out and it still stank.
Used it to fill holes in lawn from an auto accident.
I still use it in brooder, but they are only in it for a week or so before moving to coop,
and I use the 'dirty' brooder sand mix on poop boards in coop...where it does perform well.
I keep the level PDZ/sand mix on poop board only at less than a half inch and fully sift all the 'sand' mix every day or two, never have to 'replace' it just replenish as some gets kicked off and the rest sticks to poop and goes to compost. Am moving to straight PDZ as I can't find a good(washed and coarse with no dirt/dust) sand anymore.
I learned a lot about sand while making my own concrete mixes for sculpture years ago; I used different cements, different sands, different admixes.
All the colloquial and common names for sand(river, construction, play, blahblahblah) are worthless, there's no standards, you've got to look at it very closely to know what you're getting. Made a huge difference in my concrete mixes, so I had to study it, and also applies when using for chickens.
That's my thoughts on 'sand'.