It is not entirely true that I see that BTC represents the development of the Blockchain from the beginning, so its appearance is a testament to the development process later.
But there's the truth with it that if it's not about bitcoin, the introduction to the blockchain technology was much faster and easier. But it is more with the altcoin projects that this technology have been spread and became more popular.
Describe it as the process of growing a tree, when you plant a seed waiting to germinate, and here btc that seed, after time the tree grows to have branches, leaf, flowers, and fruits. And those who come later only look at things like the fruit, flowers, branches, leaf of that tree, but if they ignore the original seed, they won't see anything.
That's why no matter what people are telling about how an altcoin project is good, everyone will agree that bitcoin shall remain and it's the investment that everyone is longing for because it can't just be ignored by anyone.