You can see why there is resistance towards producing overall maps. There is absurd duplication between a lot of the train and tram services and the bus routes. Some of the best bus routes in the city are serving areas already well served by rail.
This is a huge waste of resources - a much better overall service could be provided by using the resources on frequent reliable shuttle services to get people to the trams and trains.
You have the same thing on a national scale with Bus Eireann duplicating Irish Rail services. Competition is a fine thing but not when it's between two companies in the same group.