I would agree that an anti-G suit isn't needed at all below about +5G. However, for the very high g manoeuvring which is part of the Blues formation rejoin, protection against GLOC would seem sensible.
So why not wear anti-G suits which have a modified inflation threshold - say +5G - so that protection will only be there when it is really needed and won't be disturbing during less extreme manoeuvring.
At least the Hornet doesn't used bottled air like the old Hunter did. Finding that you'd run out of puff when recovering from a strafe dive at Pembrey was always a nasty surprise. As one of my colleagues (of Jamaican descent) remarked - "When the bottles ran out, I nearly blacked out completely!"
Fortunately the data recorder has been recovered from the accident aircraft, so it should be possible to assess why the aircraft descended into the ground during that hard turn.