I'm not a professional video editor of course and everyone looks at this stuff with different slightly desires. Blender had NLE before kdenlive even existed, if I recall correctly. My comment was in reference to that period of time. It's nice to see competitors like kdenlive and natron have appeared.
What must-have features are missing? Last I checked it did basic video editing really well and it's compositing engine is really quite nice. It's not Adobe Premiere but for most use cases I've found it to be the most complete and featureful editor out there that is both multiplatform and Open Source.