Any action that he was involved in that wasn't related to hyping up either company cost them to the point that Musks interference with the updating/refreshing/new models for Tesla has resulted in no updates, no refreshes and no new models. Which is bad since the established manufacturers are closing in fast turning Tesla from a potentially big car manufacturer into a bite sized morsel for one of the established manufacturers. For a smattering of fiascos when Musk stepped outside his competency, that is hype, the following are all Musk initiated. 'Full Self Drive', 'Funding Secured', Model X gull wing doors (which incidentally almost bankrupted Tesla due to the year plus delay and costs for having to redesign the X, they only survived thanks to carbon credits), using Tesla telemetry to dox critics, using Tesla OTA to downgrade critics software, and so on.