I think it's good for the future of Mastodon as a decentralized platform to not depend essentially on any one person. After all, the web itself no longer depends on Tim Berners-Lee. That doesn't diminish their accomplishments, which were never about king-making.
Truthfully, the web never did depend entirely on Tim.
He made neither the browsers nor the servers that people used, and libwww was so full of bugs and memory leaks that it was heavily modified by those who did, if they used it at all.
A committee from the beginning would definitely prevent something from really ever starting. Could you imagine Linus working under a committee to get Linux running?
At some point, you do have people that need to step back. If you turn it over to another single person, they could pivot and "ruin" the product. By turning it over to a committee, hopefully, any ruinous ideas get overruled. At least in theory
