If those trials were anything like the Indian Army trials, then no rifle on the planet can pass them. When that is the case, it's usually a fault in the way the standards are being set in the GSQR, not a fault of the rifle. That, or someone in a position of power thinks their pocket didn't get heavy enough.
Which gun passed PA trials anyway? I don't think you selected any gun?
The US Army makes do with a direct gas impingement AR-15 (M4A1) in all corners of the world and it works fine. And a couple of third world armies can't be satisfied with a gas piston AR-15/10, which is inherently far more reliable? Yeah I call BS on that.
Besides I've seen SSG(N) personnel with SIG516 PDWs, and Turkish SOFs with full length 516s, which is basically the same gun as 716 (albeit older generation, G1 compared to the G2 we're buying) but in 5.56. Since when did regular infantry started having higher standards for their service rifles than Special forces?
