A roadmap also helps us in giving our feedback.
If they announce something, we can actually voice our opinion on it and that can affect how they use their resources, ostensibly in a good way. If on the roadmap is something an overwhelming amount of players feel strongly in a negative way about, that could indicate its a bad idea for sales or the game, and change course. Or if something on the roadmap gets a lot of positive buzz, they know they are doing something right and move forward more confidently with it.
Also knowing what we should be looking at in the EA could help.
