Thank you for reminding me about Moyes as it illustrates my point.
He was given a comically easy ride by the media, right up until united's pr department started briefing against him, upon which the hyenas turned and attacked, without mercy. It was like clockwork and pretty much overnight. The levels of nauseating sycophancy that were directed towards Moyes and united as an institution when he was appointed were beyond parody: eg "cut from the same cloth". I don't remember a single dissenting voice in the press when a man, who hadn't won a single trophy as a manager, was appointed to run a leading football club; that is truly remarkable when you consider it. Furthermore there wasn't a single question raised at the time about the self-indulgent and hubristic way that his appointment came about and was proclaimed to the old trafford crowd by Ferguson. I mean, in what organisation does anybody other than an owner appoint their own successor? I don't remember Ferguson's hugely comical ego trip being derided at the time, or since. Delia Smith wasn't given such leeway in similar circumstances, and I expect she was discernibly more sober than Ferguson when she made her infamous speech. It was a ridiculous and short sighted appointment of a man completely ill-equipped to deal with the position, both in footballing and gravitas terms, and yet at the time I don't believe a single journalist dared utter the words 'the Emporer has no clothes'. The prevailing view in the media at the time was that united must have got this right, because they always do.
If you think a City manager, appointed under similar circumstances, with a similar record at the club, would have been given until the spring before the cockroaches attacked then you are deluded beyond help.