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I don't have Excel installed, but can PDFs just fine, thank you.

If you're working solely in an environment so minimal and obscure that it can't view a PDF, I think you've lost the right to be catered to (and complain) when it comes to document format decisions.

The comparison to Excel is absurd; PDF is an open format and has been for more than five years.

what system are you running such that viewing a pdf takes 20 packages and dependencies? How are you on hacker news if you can't get your system to view pdfs?