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This has been downvoted, but I think selecting more screen-friendly fonts is a valid concern nowadays. Personally I would also like to see a reflowable format (which I guess would mean HTML with MathJax).

Use latexml this is what's running under the hood of ar5iv https://ar5iv.labs.arxiv.org/ and should be able to compile every Latex document to html

What's wrong with computer modern?

The author has uploaded a version of the book in the libertinus font - I guess he heard your complaints!

This is seriously the most insightful comment you can come up with? If it is, you would do well to consider silence.

Only the frontispiece uses a different font (can't say for sure whether it is Comic Sans though) - the rest is pure Times new Roman.

Computer Modern is the best looking font

With Comic Sans a close second, surely.