This is simply not true. You can use any C# library without using async (code rewriter). You'd still be using Tasks but there is nothing special about them (no compiler magic). They're just futures on which you can schedule continuations.
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I'm not talking about C#, but about libraries in other languages that support async behaviour
PDFJS--the PDF reading package from Mozilla--is a gross offender in this regard; the mix of sync and async, and the somewhat arbitrary nature of which is which, is pretty annoying.