OpenGL ES needs to be efficient with resources, not waste them.
In some situations, there are dramatic memory savings possible with instancing.
It can in some situations, dramatically decrease memory requirements.
OpenGL-based UI (e.g. blender's UI is OpenGL-based) can benefit from only having to hold one model, texture for each UI-element. (e.g. one for each identical button)
Small rts-games with tens of units (Possible on iPhone 3GS) can really benefit from this.
Please add instancing support because it's very useful, improves efficiency.
Allows more efficient use of memory and/or lower memory requirements.
Thanks for reading.