I am responding here to only make it apparent there is a need; however small, to utilize a feature such as clustering. I know this feature exists on the JavaScript side, albeit not native, but providing a simple feature would definitely add value.
My use case involves providing a service that allows users to quickly identify specific locations. If the person has zoomed out to a certain level then the icons overlay each other and turns my map into a chaotic mess. This is not an option for me.
As an alternative, I've created my own symbol clustering by creating an invisible grid, on a separate GraphicsLayer, then when it's time to place the symbols on the map I would iterate through my grid to retrieve my points. The number of rows and columns is dependent on the resolution value as there is no API to retrieve the zoom level. Essentially, the lower the resolution the more grid boxes in my grid. You also have to account for your grid points as some might be where they don't make sense.
