Bert Hopwood himself tells, in print, one of those stories though, so they aren't all fiction. ?
He mentions that on one occasion he had to go to the James factory, in Greet.
They had in their care a number of automatic lathes, that were turning out numerous small items for various parts as used in the AMC empire at the time.
He observed that they were turning out a lot of rejects, a LOT, and he enquired why they weren't adjusted so as to improve that reject rate.
They advised they weren't authorized to touch them, apart from feed them raw materials.
So on his return he recommended that they be allowed to do so.
6 months later, he was back there again.
And found that nothing had changed !
The reject rate was still of the order of 95% ....