As startups scale up, they usually evolve from the "just in time" startup business model - to a more traditional model.
Tesla is unusual because Musk has resisted that so far - and kept the company running in "startup" mode even as they scaled up - at least so far.
While Tesla could do better in some areas, its ability to quickly adapt and evolve could be critical in their upcoming battle with the established manufacturers as they bring competing EVs to the market. Those manufacturers have more complex business models, which makes it more difficult for them to quickly adapt. So it's difficult to classify Musk's strategy as "mis-management" - even if Tesla makes some mistakes along the way, if they can quickly recover from them, in the long run, their nimbleness may be the key to competing long-term with the bigger players.