I love my mats, but with a few horses that love to paw at feeding time a big part has to do with keeping a level floor. Mine all have in and outs, so if they want to stand/lie on dirt they can.
I do wonder about those Comfort Stall systems and soft tissue injuries. I haven’t stood on one, but if indeed it is more of a firm mattress system, I wonder if that slight lax in stability can prolong healing or ? I did like the idea of farms giving the cows water beds to lie on - wonder if my mare prone to hock and fetlock sores would like a water bed?