Well said JF.
The RAF's Tincano is operated to +6/-3 without the aid of any form of anti-g system and whilst some of my less fond memories of flight testing involved cross-calibrating the front versus rear cockpit g-meters in stages , the only time I recall any physiological problems was in a sudden reversal (whilst recovering from an oscillatory inverted spin) from about -2½g to +4g; but that sort of reversal would probably get you with a g-suit also.
Re: health and safety committees. A simulator system well known to myself and JF is, in one location, set to nominally simulate a PA28-161; the aircraft has +3.8/-1.5 limits which it manages quite happily with a 3-point car type harness. The simulator on the other hand has a 4 point aerobatic harness because, apparently, a health and safety assessment decided that the 3-point in a simulator with fairly motion capability, was inadequate. I recall making my views on that fairly forcibly when told that after I'd raised the incorrect harness in my criticisms during a cockpit assessment.
G