Quite right SSK.
Even on other rail services in the UK, doors close 1 minute before departure.
If you are unfortunate enough for your train to be on platforms 13 or 14 at Manchester Piccadilly it's a long walk, although with travelators, when working and a space they jokingly refer to as a lounge, with their "wait in lounge" message before you decend the stairs to these platforms to the scrum and hopefully board the correct train.