I can understand frustration vented at colossal structures built for wheelchair access to locations when they may almost never get used, but really, disabled access to public transport should be actively encouraged everywhere, and this includes announcements/displays, including side displays.
The peak service timetable on c2c for example is a nightmare to try and memorise which train does/doesn't bypass your station as they're all different, and if you don't hear the audio announcement on the platform (there are no tannoys at the far end of the platforms at West ham for example), there is no display down there either. No display on the side means you have to lean inside the train to try and glimpse its destination before it departs. Often, it will be scrolling a list of stations beyond the one you want, and there isn't enough time to let it come back round again before the train departs. I've missed a perfectly viable train due to that before for fear of ending up in Benfleet instead of Upminster. If the 357s had the same side displays as 377s, that'd be far less an issue. Now I'm not saying go and send them away to be modified, but any new units being refurbished should have such a feature, it's not particularly expensive, and it's very useful.
Meanwhile, there are all too often situations where the text display inside isn't working, so I have to rely on the audio announcements. No matter if I know the line, but if I don't, I like to have a fair idea when my station is approaching so I can get stuff out of the luggage racks etc.
People whining about money spent on the disabled should consider stuff like this.