One of my favourite Steve Jobs quotes is just after he returned to Apple and began dismantling the massive pile of legacy cruft. When asked about a particular (terrible) technology that Apple scrapped, Steve went on a particularly insightful rant that holds numerous insights into what he believes to be key to a successful company. And history proved those insights to be exactly right.
The quote— "Some mistakes will be made along the way. That's good. Because at least some DECISIONS are being made along the way, and we'll find the mistakes and we'll fix them." https://youtu.be/yQ16_YxLbB8?t=3286
In other words, as long as you're right often enough, being decisive is more important than being right every single time. Musk strikes me as sharing that mentality. He's right often enough that it's more efficient to "fix" the mistakes than to suffocate big decisions with big committees. And it's not like any big committee is sure to be right more often than Jobs/Elon anyway.
(That YouTube video is fantastic IMHO. Watched with the benefit of hindsight it shows that Apple's success wasn't an accident. Steve really did understand the formula that ultimately led to it.)