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Most people nowadays use phones. Mobile first isnt exactly a new concept either...

>Mobile first isnt exactly a new concept either...

It's not a landing page for some SaaS, it's a manuscript for some academic publication. "Mobile first" is definitely not top of mind.

Yea maybe adapt to what screens people use nowadays?

PDFs are not optimised for mobile screens. Adobe Acrobat Reader on mobile can reflow text (liquid mode) and fit phone screens without manual zooming.