It is good that you all have seen EFIS displays and colour radars, but what you probably haven't seen is these same displays when a colour generator (gun) fails ? The difficulties that then be caused are quite profound. I have only seen this situation on rare occaissions so you could be wholly forgiven for having no personal experience.
On a distantly related theme, my wife who flies as a cabin crew trainer for another airline recently had a case where a steward was asked to bring an oxygen cylinder where a passenger had collapsed. He returned with a fire extingusher ! At the subsequent debrief it transpired that notwithstanding the obvious differences he admitted he was "colour blind" ?
I appreciate that bringing these comments and examples into this particular "lions den" is probably futile, but it serves to highlight the point that there are valid concerns that may eventually be overcome, but are not simply satisfied by the "FACT: FACT: FACT" merchants.