I’m digressing from the point of the thread, but: that’s assuming it even is truly better for horses—our farrier is convinced it’s caused joint issues that he never used to see before it became so widespread. My trainer’s 5* horse hated working on it and she’d have to have pour pads in for dressage, cut them out for XC, and repour for SJ or he was miserable.
We’ve got a mix of rock dust and sand in our outdoor and the base was done properly so it’s a rare occasion that it remains too wet for us to ride for more than a day. I’d much rather have that than GGT (or similar), personally.