i think they’ve had field complaints about the open slide and sand and crap building up in them quickly.
I recall a bunch of slide breakage reorts in early batches as well.
I handled and shot one, really wanting to like it over the Glock and others I tried at the time. The controls and all felt right, but the shooting did not feel so correct.
I ended up with a Glock and keeping my 1911.
Recently got a Glock 30. Now, that is a very fine little handful of pistol. Dunno what issues prevent the military from considering Glock, training to use with no external safety, no doubt. But that gun is stone cold accurate, reliable, and easy to shoot.