Perhaps they have not been given the credence that you assume. It is typically not the NIMBY complainers who have the capacity to hire powerful experts to argue their cases in Councils and courtrooms ad nauseam. That is heavily weighted towards the developer side. I say that having worked for such developers, to further their cases in great detail.

Factors like failing or under-capacity infrastructure are coming to the fore a lot more in recent years. I've been in land development for about 25 years, and an increasingly common theme in my region is that a landowner wants a new suburb, but is not willing to upgrade all the necessary pipes and roads in order to not overwhelm existing upstream/downstream systems, and conversely the public are literally not able to subsidise that for them - public money is almost always stretched very thin already.