I use an Apple Pencil to annotate PDFs, making comments and drawing arrows on the margins of PDFs. I have two issues:
Even inside Acrobat for iPad, when I exit the edit mode all strokes change from having rounded to sharp corners, giving my comments a horrible, prickly appearance which is different from what I was seeing when editing.
The second issue is that some of these comments, when viewed in different PDF readers (Zotero, Mac OS' preview) become extremely thick and unreadable. I'm attaching a screenshot.