I didn't realize how much storage the fountain pen and brush pen needed to write compared to the ballpoint pen.

I am suggesting a way to destructively convert fountain pen strokes and brush pen strokes to save storage in exported PDFs and in goodnotes documents.

This would save /reduce storage space needed for a document and/or the exported PDF.

Possible UI implementation:
1. Select handwriting that was written with a fountain pen or a brush pen.
2. Open the ... button for "More settings"
3. Choose button titled "Convert handwriting to ballpoint strokes"
4. Pop-up confirms that conversion cannot be undone (except by undo)
5. Strokes are now ballpoint pen!

Alternative / supplemental possibility:
In the export menu, there is an option to use ballpoint pen strokes instead of fountain pen strokes.