'They have also had several in ground effect stalls including the last fatal one. Highly swept wings should have slats to control the boundary layer, provide a larger usable range of AoA and better stall characteristics, not least reducing leading edge stalls'
Agree, and my point exactly.
'Others marvel at the great versatility of the G550 wing without resort to any bells or whistles... '
Hardly bells and whistles, slats have been around for over 70 years and are basic aerodynamic enhancements to most modern jet's
A non slatted wing is also far more vulnerable to any wing contamination, as a few Challenger operators have discovered.
Perhaps Gulfstream just won't let that go of that G1 wing..