A beautiful and elegant thing about JavaScript is that decorators are not needed for the current functionality, as you say.
That being said, some people feel very strongly that languages are better tools when they are less elegant, when they are collections of specialized tools that communicate very specific intentions to readers.
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Static analysis is one of the end goals of this project; the other is generating documentation.
Decorators are definitely NOT needed for achieving the current functionality.
A beautiful and elegant thing about JavaScript is that decorators are not needed for the current functionality, as you say.
That being said, some people feel very strongly that languages are better tools when they are less elegant, when they are collections of specialized tools that communicate very specific intentions to readers.