Hi @ABOADAM,
Thank you so much for clearly outlining the issue and also suggesting possible solutions. You're absolutely right that Illustrator doesn't currently read PDF annotations, including FreeText comments, since it only interprets the main page content.
At the moment, a possible workaround would be to flatten the comments into the PDF content using Acrobat before opening it in Illustrator. You can do this by printing the PDF to a new PDF using the 'Adobe PDF' printer and choosing to include comments as part of the print content.
I understand that this functionality is important to you, and I apologize for its unavailability at this time. Would you mind creating a UserVoice for this feature request (https://adobe.ly/44OTtyy) and adding your comments there? Doing this will help us prioritize this request, and you'll also get notified of any updates.
Looking forward to hearing how it goes!
Abhishek