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Musk’s preoccupation with SpaceX in the last six months will have cost TSLA shareholders tens of billions of dollars in lost opportunity, as potential customers buy other cars, crossovers, trucks, non-solar roofs etc., while hundreds of thousands of Model 3 reservations holders will lose out on the $7,500 federal tax credit.
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Worth noting, Musk's occupation with SpaceX does in fact predate his occupation at Tesla.
Not only was SpaceX founded a year prior to Tesla, but, more significantly, consider the circumstances that led to the change of leadership by which Musk became an employee, CEO, of Tesla. Tesla's first product launch, the Roadster, under its initial CEO, Martin Eberhard, was far more troubled than any subsequent launch. Yes, like the Roadster, the S, X, and 3, have all been late. Uniquely, in the case of the Roadster, however, the product was not only late, but, impossibly over cost and not drivable. By impossibly over cost, at a point the vehicle was meant to be launching, Tesla was reworking basics of sourcing parts so that they could reign in some of the excess cost, and Tesla had to increase the price of the product to people who had already reserved the vehicle. By not working, I mean a vehicle that would not last a year, and IIRC, not last even a few thousand miles (yes the X, in a sense had similar issues, as far as not being deliverable due to issues with the doors... but, the basic drivetrain was worked).
To clean this up, the first CEO, Martin Eberhard was fired. Eberhard was not replaced by Musk, but, by a series of two other CEOs, before Musk determined that things were still headed off course, and he had to step in to save the company despite having another full time job. To be fair, I'm not sure if one of those other two was intended as an interim, so perhaps, it was only two intended CEOs Tesla went through before Musk stepped in fully as CEO to avert the collapse of the company.
What's more, in 2008, in the wake of the mess in cleanup mode with the Roadster program, both SpaceX and Tesla were on the verge of bankruptcy. As Musk tells it, rationally, it seemed that choosing one of the two to pour his remaining resources into was the only choice to avoid both failing. Instead, Musk poured every last dime he had into both companies, going against the odds.
None of this is to say that there's no room for feedback, constructive criticism, etc. (as it happens, when asked what advice he has for young entrepreneurs, one of Musk's two recommendations is to seek the critical feedback of people with your best interest at heart). That said, to my view, it is abundantly clear that Tesla would have failed had Musk not 1) taken double CEO duty at Tesla on top of SpaceX, and for the past decade worked 80-110 hour weeks, 2) risked going entirely broke and losing his prior startup, SpaceX, to try to save Tesla.
Just trying to offer some context as to why what some of us hear as a tone (whether intended or not) of Musk having 'failed' us, 'let us down' etc, for a preoccupation with SpaceX doesn't receive a resounding chorus of agrees.