Tom MacWright: Observable Notebooks 2.0

Observable has released Notebooks 2.0, which features an open file format and a new macOS desktop application. The update is discussed through the lens of commentary from former employee Tom MacWright. A significant change is the move to support standard vanilla JavaScript, abandoning a custom syntax like the `viewof` operator. This shift is highlighted as a positive development, as deviating from language standards creates challenges with tooling and parsers.