I'm obviously very stupid. I thought that the aircraft currently built by Airbus would fly according the manuals they publish. The performance described in their manuals could met by the crews specified in certification standards (ie. average pilots under the worst of circumstances). But obviously not. Some super-heros haven it upon themselves to do some of their own flight testing and in contradiction of the manufacturer's testing and published procedures, decided to impose more restrictive operating procedures. God, I wish I flying with people like this. I'd learn so much!
I do hope they have informed their companies of these 'extra' , beyond manufacturer limitations. Any delays, cancellations etc. as a direct result of these smaller goal posts may well result in additional compensation payouts, i.e. If you impose greater restrictions, you should pay the price.