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Welcome to Flyertalk tuffnelpark, welcome also to the BA forum. It does sound quite an extraordinary turn of events, it's difficult to judge this because on the one hand full markts for getting everyone home, on the other hand this sounds like a below minimum viable product.
I'd just highlight that unless I am much mistaken, your complaint is mainly about the way that the crew got told off by their management for not completing the service is with 3 cabin crew rotating out of 5 on board.