It’s LCD. The system to power an LCD display is hideously complicated for a public transit system. It has numerous points of failure, costs a tonne to repair and makes the train look ghetto when it is broken. That extra expense has to come from somewhere. Maybe fare increases?
In Italy, places with LCDs like Trenord and Milano Centrale all look horrible after years of ageing. Half of them are non functional, the others have yellowed. LCDs also smell like armpits when they degrade and when the polarising filter eventually separates due to the glue degrading, it makes it look like shit.
LED Arrays are simple and dumb in a good way as in not ‘smart’ tech. No ‘smart’ technology. Just replace the defective array. It’s quite modular. Robust and uses reliable mature controllers that do one job really well and does it for little cost.