My airlines policy is not to fly below green dot whilst clean, S speed with flaps 1 and F speed/managed Vapp with all the goodies GS mini gives you, it keeps you safe for the all sensible reasons.
If you are at F speed and make a 90º turn onto final then a very small overbank will have you into the "SPEED SPEED" regime. The aircraft isn't smart enough to look ahead at the flight path and see that you will be manoeuvring - that's what pilots are for. Blind reliance on the managed speed "keeping you safe" gets pilots into trouble. I would imagine that the poster who has seen this "three times in seven years" was also relying totally on managed speed.
Taking thrust levers out of CLB for more thrust has been stopped by Airbus.
I beg your pardon?