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> But why do print on demand books have to be low quality?

Because they're not fabricating any printing plates or using an actual printing press, or any technology that gets you a high quality result. A print on demand book is basically going to come out of an office laser printer, because that's the technology for low-volume printing.

Fwiw the quality of the print from the few letterpress books I own is worse than the print quality on a decent hardback.
Laser print quality today is on par with printing plates/offset printing, especially for just text.
Hell, with commercial printers from the likes of Konica Minolta, the print quality for text is better than offset print.

Most POD presses actually use inkjet because it's less expensive. The result is much lower quality.

> Laser print quality today is on par with printing plates/offset printing, especially for just text.

Why do you claim that so confidently, when many people say otherwise? Are you just going off some metric like DPI?

You're probably missing things like a sibling comment mentioned: "professionally printed books for example use slightly gray letters on creme paper." I don't think you could get "slightly gray" with a laser printer, and print-on-demand seems to basically use bright-white office paper (probably for reasons of laziness and cheapness).

> professionally printed books for example use slightly gray letters on creme paper."

Those people are fetishizing the limitations of offset printing. You simply can't produce sharp blacks comparable to an industrial laser printer with offset printing.

> I don't think you could get "slightly gray" with a laser printer

You absolutely can. But pure black on Natural Shade (off-white or cream) paper looks much better.

Most POD setups use inkjet printers for cost reasons which results in poor print quality.