So people could at least add pdf/a metadata if they are convinced that their output conforms to pdf/a.
In pdf/a a number of things are disallowed or mandatory (depending on the pdf/a profile), and there are validation tools like verapdf to check if a pdf conforms to pdf/a. A long term goal might be to support creation of proper pdf/a, manipulating a pdf to make it conformant.
When PdfFileMerger merges pdf/a files, it loses pdf/a information and resets the PDF Version to 1.3.
Example pdf/a information:
pdf/a is a standard for long-term preservation in digital archives. The more general case would be support for xmpmeta information:
https://github.com/mstamy2/PyPDF2/issues/492
So people could at least add pdf/a metadata if they are convinced that their output conforms to pdf/a.
In pdf/a a number of things are disallowed or mandatory (depending on the pdf/a profile), and there are validation tools like verapdf to check if a pdf conforms to pdf/a. A long term goal might be to support creation of proper pdf/a, manipulating a pdf to make it conformant.