That's always been my take on the matter. The Northern franchise really does leave something to be desired, and it's someone's fault. That may not be Serco/Abellio, who are fulfilling the conditions of their contract, but someone somewhere should have included some specification for at least maintaining the stock to an acceptable level
I can see why people get annoyed, but its all about the contract - look at how good FSR are due to the SQUIRE requirements (which seem really petty in some ways, but ensure that even minor problems are sorted out very quickly).
Give a private company those kind of requirements and you can then blame them for not matching up. Fail to give them strict requirements and you can't expect them to meet them.
One of the ways that third party subcontractors (like Serco) make money is by taking on a contract and then demanding more to do other/ additional things that weren't specified in the contract.
Its a bit like awarding a contract to RyanAir - it all sounds good until you realise that your contract only asked them to run the trains and it'll cost more if you want them to staff the stations or sweep up litter... (removes tongue from cheek)
Those awarding contracts should take greater care.
The only situation I can conceive is that as passenger numbers have grown, Northern have had to try and cater for that additional demand as best they can within their franchise agreement, which means hoovering up as much old stock as they can get their hands on, and maybe not giving the stock the sort of turnaround times needed to keep it in ideal condition. But even that seems a bit far-fetched to me.
Yes it means stock is used more intensively, has less time for maintenance which doesn't help matters at all!
Stock does seem to be used intensively, with little in the way of spare resources - yet they are blamed for putting the cascaded 150s straight into service (rather than spending months upgrading them, despite all of the criticism about "overcrowding).
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Rolling stock reburbishment is a failure of Privatisation, In my view a mininum level of refurb should have been set at various intervals over the lifecycle of the rolling stock and should have been the responsibility of the train owners, say at 10 years intervals with possible exceptions for rolling stock which might be retained for only a short period over the 10 year interval. The TOC's could optional pay for enhancements.
An important point.
People want Northern to spend money upgrading trains that don't belong to them, on a franchise that they'll only hold for a few more months.
I agree that the ROSCO should pay for this kind of thing.