We had this ever ongoing debate about walk round & hydraulic pumps. The SOP (contrary to Boeing) had been to turn all pumps off. The new crew arrives, and wanting to save time as the pax are disembarking, does a walk round own side each. Except the incoming crew has turned the HYD pumps off. Much banging on the fuselage and signalling to leave the pumps ON. Eventually, after much wringing of hands and tugging of hair, the company decided to go with Boeing and leave pumps on. So following the manufacturer's recommendations solved our dilemma. There were other deviations e.g. full IRS alignment that eventually went the way of the designers.
I often wondered why it was airlines with no experience of the new technology who changed the manufacturer's procedures the most. Curious that.