It isn't as simple as that, 40 years ago the railway had more staff available at stations than nowadays, be it on the platform or in the booking offices/TEBs, and fewer trains to deal with. Things like train despatch still have to go on in such cases.
At stations like York and Doncaster, there are many other TOC's trains feeding passengers into the system which don't stop doing so when the main line is closed, both those trains and their passengers have to be dealt with at the same time as the disrupted services and so on. Peterborough and Darlington have similar issues to a slightly lesser extent, and even Grantham and Newark do to a much lesser extent.
I am not suggesting for a moment that things are ‘simple’ but it is a basic management responsibility to ensure that current methods are appropriate for times of disruption as well as normal operation. It also needs staff with a customer focus ready to embrace modern technology in assisting passengers rather than simply seeing their tablet as a justification for an extra payment with no will to actually exploit it!
I have already noted that extra trains and increased disruption should logically require more staffing, whether in control, information or ‘platform’ roles.
‘Back in the day’ almost every intending passenger arriving at a station would interact with the booking clerk, barrier staff or both on arrival. Just the moment for a conversation along the lines of, “I see you’re heading for Waterloo. Unfortunately, because of a displaced conductor rail at New Milton all the trains are trapped on the Bournemouth side of it. You may well be delayed by a couple of hours. It may well be worth catching a local service to Fratton and then a train on the Portsmouth line”.
These days a passenger is likely to have their ticket on their phone, breeze through the barriers wearing headphones playing their favourite heavy metal track, oblivious to any screens (other than their phone) and then find themselves on the platform with a thousand other people all wondering where the trains have got to.
It’s hard to deal with that sort of environment.