Here's how I see it...
There are many very standard situations across RPGs where different symbols are commonly used on maps. For example, secret/concealed doors, traps, initial locations of monsters, and a host of others immediately spring to mind. These are of GENERAL USE to the vast majority of users, and they make maps significantly more informative than having a single generic pin for everything. So they are something we definitely should include.
Will we be able to make everybody happy with the perfect set of icons that meets everyone's individual needs? Nope. That's not the objective.
The objective is to provide significant benefit and utility to the vast majority of users. We'll never be able to be perfect for everyone. But we CAN be highly useful for everyone. Once we identify the "standard" set of icons for common needs (like traps and secret doors), it's of little extra work to include a smattering of additional icons that users can leverage for their own purposes. Will those icons be perfect for everyone? Not at all. But they will be a reasonable solution for negligible extra work on our part, which will make lots of users happy. Why? Because those users now have something that's "good enough" for their needs.
@AEIOU: To use the restaurant analogy, virtually every restaurant offers a salad option. Are they great salads? For many restaurants, no way. But people still order them at those places. Why? Because the salad isn't (usually) the focus of the meal for those people, yet having a salad is beneficial for digestion (keeps the pipes running smoothly, so to speak). If the restaurants didn't offer salads, their business would decline - that discovery is why seemingly every restaurant started to offer them in the first place. People want a decent salad to go with the main meal they are ordering - and that main meal is the reason they came to the restaurant in the first place.
In the same vein, providing a reasonable assortment of icons for general use on maps will be exactly like offering salads on our menu. The icons are not why consumers will choose Realm Works in the first place. They'll come to Realm Works for all the cool features for weaving a campaign together. However, the lack of icons could be why a reasonable number of prospective users would turn away from Realm Works in the end. Just like restaurants, we need some decent salads on the menu, and icons represent a salad option. Just like any restaurant, there are the "signature dishes" on the Realm Works menu, and there are lots of other dishes that flesh out the menu. Users will come for the signature dishes. They'll stay because of the full menu.
Hope that makes sense!!!