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"Simpler design" should have a disclaimer. It's interesting that you could possibly do away with camshafts, but without additional hardware you now have a fixed valve timing engine. I foresee most solutions to this being more complicated and potentially more failure prone than a balanced rotating shaft.
Plug-in hybrids (or EVs with "range extenders) are certainly one solution to battery limitations, but ICEs today are large and complicated, and take up a significant portion of a vehicle. Anything that can downsize the footprint without sacrificing efficiency would be great.
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