The operators are given long contracts to run the service. They don’t get a phone call from Andy Burnhan telling them to make a balls of running it. Similarly, Amey, who have the contract to manage the stock don’t get told how to do it.
The failure of the tram system was inevitable once it was designed ‘on road’ and, as usual with UK infrastructure, it was done on the cheap.
Finally, unlike TFL, the Manchester Metro attracts no government subsidy meaning modernisation and upgrades are done in a piecemeal fashion.