There's no such thing as an ecosystem that isn't always churning through stuff (other than a dead one). The premise you're floating doesn't exist.
Silicon Valley's 10% is better than the 10% anyone else produces. It also does it at a higher volume simultaneously. That's why it's Silicon Valley and nobody has managed to match it in the last 50 years.
But some of that ecosystem is just dead slack. It exists because it exists, because part of how SV works is VCs have to find new winners and people want to change jobs and have more options. If that is not your main goal, you don't need the ecosystem.
SV is good at what it does, it's the best at what it does, but that's orthogonal to building a great company. We believe it's necessary because that's how it has been done.
Silicon Valley's 10% is better than the 10% anyone else produces. It also does it at a higher volume simultaneously. That's why it's Silicon Valley and nobody has managed to match it in the last 50 years.