Bingo. Hard-core engineering has been the lynchpin of Tesla and SpaceX's success -- they literally won via designing and manufacturing superior physical things.
It makes sense that EM would blunder by attempting to reproduce that type of success at Twitter. And it will be a blunder, unless: (a) he plans to build one or more new products (or drastically change the nature of the existing product), and (b) those new or drastically changed products will somehow "win" in a big way that Twitter isn't winning now.
But at least to me, (a) doesn't seem likely and (b) seems even less likely.