Workings don’t need to be “very perturbed” for platform allocations to change, I can assure you.
Can I ask, do you have any operational railway experience, to inform your comments?
At GA we would regularly have platform alterations during normal running at Audley End Down Trains into Up platform to allow ease of access for passengers with reduced mobility for example, although that wouldn't be done at short notice. other examples can be to allow patrolling at places like Ilford flyover where a few stopping trains would use the Up Main rather than the Up Electric platform, I can't remember now as it is nearly 10 years since I was responsible for Ilford if these were programmed or we had to do manual changes, Hackney Downs was another location where platforms could be swapped at short notice during normal running.
You have to also realise control room staff are not only monitoring trains and altering platforms, they are also communicating with station staff etc, and in my case as a manager potentially with the Police, London Buses, London Underground, replacement bus co-ordinators, other TOC's, NRES, local and senior managers including in major incidents the media via GA press team. You could have shifts where you have very little to do and others where all hell lets loose the moment you takeover, I remember one particular late turn where I had 3 major incidents occur within an hour of each other in 3 different senior and local manager areas, they only had to worry about their one incident I had to be on top of all three. those incidents and their aftermaths lasted all shift but time flew. So as I said before things can get missed I never wanted it to happen on my shift none of us did or do but it does happen.
On a slightly different but related theme our busiest through Southminster train at Liverpool Street in the evening peak used to leave from platform 12 and regular customers knew this and waited on the platform before the incoming train arrived so they could bag their favourite spot, one night a Norwich set arrived in twelve (services were running ok but there had been a slight late departure from the Norwich's normal platform) and despite announcements for Southminster line customers to return to the main concourse as this wasn't their train to await further announcements a fair number boarded the Norwich service which hadn't been advertised as it was being cleaned and prepared and returned later to complain etc. so sometimes the poor old info team and announcers just can't win.