Exactly. PDF is digital paper. The "print to PDF" metaphor is perfect. If you've printed something and decide you want to change it, you don't grab white out

Exactly. PDF is digital paper. The "print to PDF" metaphor is perfect. If you've printed something and decide you want to change it, you don't grab white out, you open the source file up and change it then print again. If editing PDFs is something you find yourself needing to do regularly, something is very wrong with the process that's leading to this. It may not be your fault, it may be an upstream party who should be providing you with the source material, but either way making PDFs easier to edit is not the correct solution.