When exporting to pdf, if there are missing fonts, links and/or overset text (probably some other options), we will have a prompt saying that we have those kind of errors and InDesign will allow us to fix the errors before creating the pdf.

In the other hand, if we have missing glyphs for example, InDesign will create the pdf without any warnings.

You can see the errors in the preflight panel but I think it can be easily overseen and this extra security step would help to fix these errors if needed.

I think Indesign should show this prompt every time there is an error in your preflight so you can decide if create the pdf or not.