More and more documents are being published only as HTML without a PDF version (e.g. UK Government official guidance). I'd love to be able to grab a snapshot of a webpage into my notebook to scribble on. Print to PDF only sort of works for most pages, whereas if GoodNotes could render the HTML itself there is scope for a much better experience.

Add all the obvious missing features (sticky notes, word searching, handwriting to text etc.) and it becomes a better-than-PDF alternative.