The hard part of PDF generation is support for complex script (Arabic, Indian languages etc.), including embedding a font subset. On Windows this is usually accomplished using the Uniscribe library (which is not available on Linux). QuestPDF appears to be using HarfBuzz for this purpose. If that works well then this is a winner!
Gold standard? Even though serious bugs are not fixed [1] because "the code is too fragile to touch at this point"? Looks like Android uses HarfBuzz, if so it can't be that bad.
