Apart from the device size issue this is untrue.

Of course it is, these form just a tiny subset of well known issues of PDF.

Here is a simple illustration of a copy & paste fail from this very page:

From html: a single sentence

> Since mozilla announced the sunsetting of pocket, I started looking for alternatives, including building a light version for my personal use. But nothing came out of my research.

From PDF: a newline split of a single sentence after light because PDF is generally too dumb to use sentences for text

> Since mozilla announced the sunsetting of pocket, I started looking for alternatives, including building a light > version for my personal use. But nothing came out of my research.

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crinkly 8 hours ago | parent [-]

Literally works fine here.

"volume needs to be the lowest possible. A minimisation problem needs two variables only and we have four in this case. However the volume and area formulas can be substituted into each other to give volume in terms of width."

Cut and pasted from three lines of a PDF I am authoring right now.

	▲	eviks 8 hours ago \| parent [-]
		> Cut and pasted from three lines of a PDF I am authoring right now. Literally a different use case. Do the steps from your actual workflow that I commented on instead of trying to find a variant where it works! Maybe the app you use adds special PDF clutches to make a paragraph a paragraph.