I, for one, agree with the general thrust of the news article. It's all well and good those with a far more intricate understanding of the railway knowing that such and such a service will normally be a class whatever train which does or does not include first class accommodation etc.
But for the ordinary rail passenger, who approaches an automated machine or a ticket window and requests a first class ticket between A and B, it surely isn't unreasonable to expect first class accommodation to be available between A and B if a ticket has been sold to you.
In my part of the world, for example, Northern and fTPE run services. fTPE's class 185s have a dedicated first class section whilst none of Northern's trains do as even the 180s have been declassified. But how many ordinary rail passengers in my neck of the woods know that. Certainly, when I even begin to explain it to friends and family they all start yawning and calling me an anorak.
Tickets which are only valid on a specific service will, I presume, be sold correctly but for those less specific service tickets, it should be made clear prior to sale what first class accommodation is actually available. I know the rare occasion I book first class at the fastticket machines, there's no mention of only fTPE conveing first class accommodation on my daily commute and I wonder whether dealing with a human ticket clerk would be any different.
So perhaps we need to think more like typical rail passengers rather than those with intricate knowledge of diagrams, vehicles, seating layouts, etc.