They have not killed LightWave in the legal sense. They still own and are selling it as a product.
There is lots of discussion here comparing LightWave to Blender. Some similar features have been added with addons. And some discussion about things that would be still good to have in Blender. And it would be a good place to look for what those might be. I think it would be more likely to develop anything new for Blender, considering LightWave is really not available. And may never be.
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